Glossary of Zoological Terms → Contents
A

Abactinal (Aboral), Abambulacral, Abambulacral surface, Abapical, Abaxial, Abdomen, Abdominal air-sac, Abdominal appendages, Abdominal cavity, Abdominal foot, Abdominal limb, Abdominal pore, Abdominal reflex, Abdominal region, Abdominal rib, Abdominal ring (Inguinal ring), Abdominal sense organ, Abdominal vein, Abdominopelvic, Abducens nerve, Abducent, Abducent foramen, Abducent nerve, Abduction, Abductor, Abductor muscle, Aberrant, Aberrant commissure, Aberrant forms, Aberration, Abfrontal, Abiogenesis, Ablactation (Cessation of milk), Ablasting, Abnormality, Abomasum, Aboral (Abactinal), Aboral perihaemal sinus, Aboral ring sinus, Aboral sinus system, Aborigines, Abort (ref. to embryo), Abort (ref. to organs), Abortion, Abortive (Aborted), Abranchiate, Abrasion, Abrupt, Abscess, Absciss, Abscission, Absolute refractory period, Absorption, Absorptive state, Abstriction, Abundance, Abundant, Abyss, Abyss-benthic, Abyssal (Abysmal), Abyssal benthic, Abyssal pelagic, Abyssopelagic, Acanthaspid, Acanthella, Acanthin, Acanthobdella, Acanthocephala, Acanthocephalan, Acanthocephalous, Acanthodii, Acanthopterygian, Acanthor, Acanthore, Acanthozooid, Acapnia, Acaricide, Acarids, Accelerated divergence, Accelerator, Accelerator nerve, Acceptor cell, Accessory, Accessory factor, Accessory female glands, Accessory food factors, Accessory gland, Accessory nerve, Accessory nidamental gland, Accessory pulsatory organ, Accessory sac, Accessory scapula, Accessory sperm, Accessory tarsal, Acclimation, Acclimatization (Acclimatation), Acclimatized, Accommodation of the eye, Accretion, Acentric, Acentrous (ref. Vertebra), Acephalocyst, Acephalous, Acephalous larva, Acerate, Acervuline, Acervulus, Acetabulum, Acetabulum (of pelvis), Acetylcholine, Achaetous, Achrodextrine, Achroglobin, Achromasia, Achromatin, Achromatinic, Aciculum, Acidophil, Acidophilic, Acidosis, Aciniform, Aciniform gland, Acinus (pl. acini), Acipensor, Acne, Acoela, Acoelomate, Acoelomate stock, Acoelous, Acondylous, Acone, Acontium, Acoustic, Acoustic (Auditory ; Otic), Acoustico-lateral (lateral line), Acoustico-lateral centre, Acoustico-lateral nerve system, Acoustico-lateralis system, Acquired character, Acquired Immune Deficiency Syndrome (AIDS), Acquired immunity, Acquisition, Acrania, Acraniate, Acraspidate, Acroblast, Acrocentric, Acrocoracoid, Acrocoracoid process, Acrocyst, Acrodont, Acromegaly, Acromial, Acromio-clavicular, Acromion, Acromion Process (Acromion), Acron, Acrorhagus, Acrosome(Perforatorium), Acroteric, Acrotrophic, Actin, Actinal (Oral), Actinal (Radial), Actine, Actinobiology, Actinoblast, Actinoid, Actinomorphic (Actinomorphous), Actinopterygii, Actinopterygium, Actinostome, Actinotrichia, Actinotrocha, Actinozoan, Actinozoan polyp, Actinula, Action-potential, Activation, Activator, Active immunity, Active migration, Active pronucleus, Active site, Active transport, Activity, Acuity, Aculeata, Aculeate, Ad-digital, Ad-digital-remex, Adamantoblast, Adambulacral, Adambulacral ossicle, Adambulacral spine, Adaptability, Adaptation, Adaptational need, Adaptational structure, Adaptational value

B

Babirussa, Baboon, Bacillary dysentery, Bacillus, Back-cross, Backbone, Bacteria, Bacterial disease, Bactericidal, Bacteriology, Bacterium, Bacteroidal cell, Badger, Balance of nature, Balanced polymorphism, Balancer, Baleen whale, Ball and socket joint, Band-shaped, Banded ant-eater, Bandicoot rat, Bar gene, Bar mutation, Barb, Barb (of feather), Barbed proboscis, Barbel, Barbicel, Barbule, Bark beetle, Barn door fowl, Barnacle, Baroceptors (baroreceptors), Barrel-shaped, Barrier reef, Basal body, Basal cartilage, Basal disc, Basal element, Basal ganglion, Basal granule, Basal metabolism, Basal plate, Basal process, Basalia, Basals (Basal Plates), Base, Basement membrane, Bases cranii, Basi-dorsal, Basi-facial, Basi-facial axis, Basi-hyal, Basibranchial, Basibranchialcartilage, Basibranchiostegal, Basic number, Basicranial axis, Basicranial fontanelle, Basilar, Basilar membrane, Basioccipital bone, Basipodite, Basipterygium, Basipterygoid, Basisphenoid, Basiventral, Basking shark, Basommatophora, Basophils, Bass, Bat, Batesian mimicry, Bathybic, Bathypelagic, Batrachian, Battery, Beach seine, Beak, Beaked Whale, Bear, Beaver, Beche-de-mer, Bed bug, Bee, Bee-bread, Beetle, Behavioral ecology, Behaviour, Belemnite, Belemnoid, Bell shaped curve, Belly, Belly-crawling, Benign, Benign tertian fever, Benthal, Benthic, Benthic animal, Benthic region (Benthal), Benthonic, Benthos, Benthos individuals, Bentonite, Bergmann's rule, Beri-beri, Bettongia, Bicellular glands, Biceps femoris, Biceps muscle, Bicipital groove, Bicornuate, Bicuspid tooth, Bicuspid valve, Bidder's organ, Bifid, Biflagellate, Bifurcate, Bifurcation, Bilateral, Bilateral symmetry, Bile, Bile canaliculus, Bile channel, Bile duct, Bile pigment, Bile salt, Bilirubin, Biliverdin, Bilobate, Bilobed, Bilophodont, Binary-fission, Binocular vision, Binomial distribution, Binomial nomenclature, Binucleate, Bio-characters, Bio-mass, Bioaccumulation, Biochemical, Biochemical Oxygen Demand, Biochemistry, Biochore, Biocoenosis, Bioconcentration, Biocycle, Biodiversity, Biodiversity convention, Biofeedback, Biogenesis, Biogenesis (Theory of), Biogeochemical cycles, Biological adaptation, Biological clock, Biological control, Biological data, Biological inheritance, Biological niche, Biological Oxygen Demand (BOD), Biological productivity, Biological race, Biological reaction, Biological relation, Biological species, Biological variable, Biology, Bioluminescence, Biomagnification, Biome, Biometry, Bion, Bionomics, Biophysicist, Biophysics, Biopsy, Biosphere, Biosynthesis, Biota, Biota community, Biotechnology, Biotic factor (Biological factor), Biotype, Biped, Bipedalism, Bipinnaria, Bipolar nerve-cell, Biramous, Biramous appendage, Biramous limb, Bird-lice, Birefringence, Birth, Birth opening, Biserial, Biserial type, Bisexual, Biting lice, Biting mouth parts, Bivalent

C

Caddis-fly, Cadophore, Caecal (Cecal), Caecal pouch, Caecum, Caecum (of mammalian intestine), Caenogenesis, Caenogenetic, Caiman, Calamus, Calamus scriptorius, Calcaneal process, Calcaneum, Calcar, Calcareous, Calcareous deposit, Calcareous node, Calcareous salt, Calcareous spicule, Calciferol, Calciferous, Calciferous gland, Calcification, Calcified cartilage, Calcite, Calcitonin (CT), Calcium soap, Calcosphaerite, Calculated value, Calibration, Callosity, Callous patch, Calorie, Calotte, Caltrop, Calymma, Calypter, Calyptoblastic (thecate), Camel, Camouflage, Campaniform (Campanulate), Campaniform sensillum, Campanual Halleri, Campodeiform, Canada Balsam, Canal, Canal of Laurer, Canal system, Canaliculate, Canalicule (Canaliculus), Canaliculi of cosmine, Canaliculi radiate, Cancellated bone, Cancerous cell, Canine (tooth), Canker, Cannibalism, Cannon bone, Cap of dentine, Capacitation (sperm surface), Capillarity, Capillary, Capillary vessel, Capillitium, Capitate, Capitellum, Capitular facet, Capitulum, Capsular contents, Capsular fluid, Capsule, Capsule of eye, Capsulogenous gland, Capuchin, Caput epididymis, Carapace, Carbohydrase, Carbohydrate, Carbon cycle, Carbon dioxide, Carbon splitting, Carbonaceous, Carboniferous, Carcase, Carcinogen, Carcinogenic sterol, Cardia, Cardiac, Cardiac chamber, Cardiac limb (of stomach), Cardiac muscle, Cardiac ossicle, Cardiac output, Cardiac region, Cardiac reserve, Cardiac stomach, Cardinal process, Cardinal sinus, Cardinal vein, Cardio - accelerator centre, Cardio - inhibitory centre, Cardio-pyloric valve, Cardioblast, Cardiopulmonary, Cardiopulmonary resuscitation (CPR), Cardiovascular, Cardo, Caridoid facies, Caries, Carina (Keel), Carina sterni, Carmine, Carnassial, Carnassial teeth, Carnivore, Carnivorous, Carotico-systemic aorta, Carotid, Carotid arch, Carotid artery, Carotid body, Carotid foramen, Carotid gland, Carotid labyrinth, Carotid sinus, Carotid sinus reflex, Carotid trunk, Carotin, Carp, Carp louse, Carpal, Carpal bone, Carpet shark (Spotted shark), Carpo-metacarpus, Carpopodite, Carpus (Wrist-bone), Carrion-feeding, Carrying capacity, Cartilage, Cartilage bone, Cartilage of Santorini, Cartilaginous, Caruncle, Case, Casein, Caseinogen, Casoni reaction, Casque, Cassowary, Cast net, Caste, Castings, Castrate, Cat-fish, Catabolism, Catadromous, Catagenesis (Retrogressive evolution), Catalase, Catalysis, Catalyst, Cataract, Catarrhini, Catastrophism, Caterpillar, Cathartic, Catherine-wheeling, Cauda, Cauda epididymis, Cauda equina, Caudal artery, Caudal filament, Caudal fin, Caudal ganglion, Caudal pterylae, Caudal rami, Caudal region, Caudal shield, Caudal spine, Caudal style, Caudal swelling, Caudal telson, Caudal vein, Caudal vertebra, Caudal vesicle, Caudate, Caudate lobe, Caudofemoralis muscle, Causal-analytical, Caval vein, Cave-dwelling, Cavies, Cavity, Cavum aorticum, Cavum arteriosum, Cavum pulmocutaneum, Cavum pulmonale, Cavum venosum, Cecal (Caecal), Cecal region, Celery-fly

D

Dactylopodite, Dactylopore, Dactylozooid, Daddy-long legs (Crane fly), Dalyellia, Daphnia, Dart, Dart sac, Dart-like, Darwinism, Dasypodoidea, Dauer-modification, Daughter cell, Daughter chromosome, Daughter cyst (Secondary cyst), Daughter nucleus, Daylight vision, Dazed, De-differentiation, De-novo, Deafness, Deaminase, Deamination, Death-rate, Debility, Debris, Decadence, Decaploid, Decapod, Decapoda, Deceptive diseases, Decerebrate, Decerebrate rigidity, Decidua, Decidua basalis, Decidua capsularis, Decidua vera, Deciduate, Deciduous gilled, Deciduous teeth, Decomposer, Decremental, Decremental conduction, Decussate, Decussation, Deep - litter, Deep-staining, Deer, Defaecate, Defaecation, Defence mechanism, Defensive mechanism, Defibrillation, Deficiency, Deficiency disease, Deficient, Defined environment, Definitive host, Deflection, Defoliator (insect), Deform, Deformation, Degenerate, Degenerate condition, Degenerate parasites, Degeneration, Degenerative, Deglutition, Degree of constancy, Degree of improbability, Degree of vascularization, Dehaemoglobinized, Dehaemoglobinizing, Dehiscence, Dehorning, Dehydration, Dehydration reaction, Dehydrogenase, Delamination, Delayed anaerobic heat, Delayed recovery, Deleterious effect, Deleterious gene, Deletion, Delirium, Deltatheridium, Delthyrium, Deltidium, Deltoid crest, Deltoid muscle, Deltoid plate, Deltoid ridge, Deme, Demersal, Demi-facet, Demineralization, Demodectic mange, Demography, Denaturation, Dendrite (Dendron), Dendritic, Dengue fever, Dense, Density function, Dental formula, Dental groove, Dental lamina, Dental papilla, Dental sac, Dentary, Dentary region, Dentencephalon (Epichordal brain), Denticle, Dentine, Dentition, Denudation, Dephosphorylation, Deplumation, Depluming, Depolarization, Depressing influence, Depression, Depressor, Depressor muscle, Deric epithelium (Epidermis), Derivative, Derived character, Dermal (Cutaneous), Dermal armour, Dermal body, Dermal bone, Dermal branchium, Dermal cortex, Dermal defence, Dermal denticle, Dermal exoskeleton, Dermal fin-ray, Dermal layer, Dermal plate, Dermal pore, Dermal teeth, Dermanyssid mite, Dermaptera, Dermatitis, Dermatome, Dermis, Dermocranium (Membranocranium), Dermotrichia, Descended, Descending cornu, Desensitization, Desensitized, Desiccated, Desiccation, Desmognathous, Desmolase, Desmoneme, Desquamation, Destructive, Destructive metabolism (Catabolism), Destructive power, Destructive process, Detergent, Determinate, Determinate cleavage (ref.Embryology), Determinate type (mosaic type), Determination, Detorsion, Detoxified, Detritus, Detritus feeders, Deutocerebrum, Deutomerite, Deutoplasm (Yolk), Development, Deviation, Dextral, Dextrin, Dextrose, Diabetes mellitus, Diabetogenic hormone, Diabranchiate, Diacoel (Third ventricle), Diactine, Diagnosis (Disease), Diagnostic, Diagnostic feature, Diagram, Dialysate, Dialysis, Diapause, Diapedesis, Diaphragm, Diaphysis, Diapophysis, Diaposematic, Diapsid, Diapsida, Diarrhoea, Diarthrosis

E

Ear, Earth summit, Earwig, Ebony mutants, Eccentric, Ecdemic, Ecdysial excretion, Ecdysis, Echidna, Echidna pterygoid, Echinocymus, Echinoderm, Echinodermata, Echinoidea, Echinopaedium, Echinopluteus, Echinostomes, Echiurida, Echo-sounding, Echolocation, Ecological, Ecology, Economic injury level, Economic threshold, Ecosystem, Ecotone, Ecotype, Ecto-cuneiform, Ecto-ethmoid, Ecto-pterygoid, Ectocyst, Ectoderm, Ectodermalization, Ectolecithal, Ectoloph, Ectoneural system, Ectoparasite, Ectoparasitic, Ectoplasm, Ectoprocta, Ectosarc (Ectoplasm), Ectotherm, Ectothermic, Ectothermy, Ectotympanic (adj), Edentate, Edibility, Edriasteroidea, Eel, Effective breeding population, Effector neuron, Effector organ, Effector unit, Efferent, Efferent branchial artery, Efferent duct, Efferent fibre, Efferent neuron, Efferent vessel, Efferentnephridial vessel, Efficacious, Efficiency, Egestion, Egg, Egg capsule, Egg case, Egg counts, Egg duct, Egg envelope, Egg jelly, Egg membrane, Egg sac, Egg tooth, Egret, Ejaculation, Ejaculatory duct, Elasmobranch, Elastic cartilage, Elastic membrane, Elastic rod, Elastica externa, Elastica interna, Elastin, Elbow joint, Electric eel, Electric lobe, Electric organ, Electric ray, Electrocardiogram (ECG), Electrocardiography, Electroencephalogram (EEG), Electromagnetic spectrum, Electromicrography, Electron transport chain, Elephant-like, Elephantiasis, Eleutherozoa, Elevation, Elevator muscle, Ellipsoidal, Elytron (of polychetes), Elytrum, Emaciated, Emaciation, Emargination, Embed, Embioptera, Embolic gastrula, Embolism, Embolomerous, Emboly, Embryo, Embryo-filled uterus, Embryology, Embryonal disc, Embryonal knot, Embryonate, Embryonic, Embryonic chick, Embryonic disc, Embryonic endoderm, Embryonic fission, Embryonic knob, Embryonic membrane, Embryonic plate, Embryonic rim, Embryonic shield, Embryonic stage, Embryophore, Embryotroph, Emergence of pattern, Emetine, Emigrant, Empodium, Emu, Emulsified, Enamel, Enamel membrane, Enamel organ, Enamel pulp, Encapsulated, Encephalocoele, Enchylema (cell sap), Encrustation, Encrusted, Encystation (Encystment), End plate potential, End-bud, End-organs, End-products, End-sac, Endamoeba, Endemic (as in disease), Endemic (as in species), Endemic goiter, Endergonic reaction, Endite, Endocardium, Endochondral ossification, Endocrine action, Endocrine gland, Endocrine organ, Endocrine system, Endocuticle, Endocyclica, Endocytosis, Endoderm (Entoderm), Endodermal lamella, Endodermal plate, Endodermalization, Endodermic disc, Endogamy, Endogastric curvature, Endogenous, Endolecithal (Entolecithal), Endolimax, Endolymph, Endolymphatic duct, Endometrium, Endomixis, Endoneurium, Endoparasite, Endophragmal skeleton, Endophragmal system, Endoplasm (Endosarc), Endoplasmic reticulum, Endopodite, Endoprocta, Endopterygota (Holometabola), Endoskeleton, Endosome, Endosternite, Endosteum, Endosthecum, Endostyle, Endothelial, Endothelio-chorialis, Endothelium, Endotherm, Endothermic

F

Fabella, Facet, Facial, Facial nerve, Facial suture, Facies, Facilitated diffusion, Facilitated transport, Facilitation, Facilitatory effect, Factor, Facultative, Facultative parasite, Faeces, Falciform, Falciform ligament, Falciform process, Falciparum malaria, Falcon, Fallopian tube, False amnion (Chorion, Serosa), False rib, False warning colour (pseudaposematic), Family, Fan like, Fang, Fantail, Fasciculus, Fasciole, Fat, Fat body, Fat cell, Fat metabolism, Fat-soluble, Fat-splitting, Fate-map, Fatigue, Fatty acid, Fauna, Feather, Feather follicle, Feather germ, Feather papilla, Feather pulp, Feather star, Feather tracts (Pterylae), Feed - back mechanism, Feedback inhibition, Feeding, Feeding flock, Feeler, Felt, Female, Female pronucleus, Femoral artery, Femoral vein, Femur, Femur (of insects), Fenestra, Fenestra ovalis, Fenestra rotunda, Fenestral recess, Fenestrated membrane, Feral, Ferment, Fermentation, Fertility, Fertilization, Fertilization cone, Fertilization membrane, Fertilization pouch, Fertilized egg (Zygote), Fertilizin, Fertilizing duct, Festoons, Feulgen - positive, Fibre, Fibrilla, Fibrillated, Fibrillation, Fibrin, Fibrinogen, Fibroblast, Fibrocartilage, Fibrocyte, Fibroma, Fibrous sheath, Fibula, Fibulare, Field, Fifth instar, Fight or flight response, Fila olfactoria, Filament, Filaria, Filariform, Filibranchiata, Filiform, Filoplume, Filopodia, Filose, Filter, Filter chamber, Filter-feeders, Filtering apparatus, Filtrable virus, Filtration pressure, Filum terminale, Fimbria, Fin, Fin ray, Fin-whale, Final host, Finches, Fingerlings, Finlet, Fire-fly, First filial generation, First maxilla, First radial ossicle, Fish kraals, Fish-eater, Fish-louse, Fisher's theory, Fishing gear, Fission, Fissure, Fissurella, Fitness, Five-chambered organ, Five-flagellated, Five-toed foot, Fixation disc, Fixatives, Fixed, Fixed action patterns, Fixed cheek, Flabby, Flabellum, Flagellata, Flagellate, Flagellate canal, Flagellated body, Flagellated chamber, Flagellispores, Flagellula, Flagellum, Flagship species, Flame bulb, Flame cell, Flange, Flap-like, Flapping, Flat fish, Flat foot, Flat worm, Flattened bar, Flea, Flea-borne, Flea-infested, Flesh-eating, Flexed, Flexible, Flexion, Flexor, Flexor cruris, Flexor muscle, Flexure, Flickering, Flight, Flipper, Float, Floatation method, Floating rib, Floccular fossa, Flocculation, Flocculus (of Cerebellum), Flock, Florida strains, Flour-moth, Fluctuation, Fluctuation (in Evolution), Fluid feeders, Fluid mosaic model, Fluke, Fluke Blood, Fluke Liver, Flushing, Flustra, Fluted, Fly-transmitted, Flying fish, Flying fox, Flying lemur, Flying phalanger, Flying squirrel, Foetal marsupial, Foetal membrane, Foetal placenta, Foetalisation

G

Gait, Galactose, Galapagos Islands, Galaxy, Galea, Gall, Gall bladder, Gall-midge, Galliform bird, Gambia fever, Gamete, Gametic nucleus, Gametic selection, Gametocyst, Gametocyte, Gametogenesis, Gametophyte, Gamocyst (Sporocyst), Gamogony, Gamont (Sporont), Gamonticide, Ganglia Habenulae, Ganglion, Ganglion impar, Ganglionated, Ganglionic enlargement, Gangosa, Gangrene, Ganoid scale, Ganoine, Gap junction, Gape, Gapeworm, Gar-fish, Garbage, Garbage worm, Gartner's canal, Gas vacuole, Gaseous interchange, Gasserian ganglion, Gastatory organ, Gasteropod, Gasteropoda, Gasterostome, Gastraea, Gastral (gastric), Gastral cell, Gastral cortex, Gastral filament, Gastral gland, Gastral haemal tuft, Gastral juice, Gastral mill, Gastral ostium, Gastral pouch, Gastral ridge, Gastral shield, Gastral vein, Gastrin, Gastro-cutaneous pore, Gastro-hepatic omentum, Gastro-intestinal, Gastro-intestinal symptoms, Gastro-intestinal tract, Gastro-splenic omentum, Gastrocentrous, Gastrocnemius muscle, Gastrocoel (Archenteron), Gastrodermis, Gastrolith, Gastropod, Gastropoda, Gastropore, Gastrotrichia, Gastrovascular, Gastrovascular cavity, Gastrozooid, Gastrula, Gastrula larva, Gastrula mouth, Gastrulation, Gavial, Gecko, Gelatinous, Gelatinous zonule, Gelation, Gemmation, Gemmation (Budding), Gemmule, Gena, Gene, Gene action, Gene cloning, Gene locus, Gene mutation, Gene pool, Gene therapy, Generalized, Generalized structure, Generation, Generative cell, Generative duct, Generative nucleus, Genetic, Genetic affinity, Genetic constitution, Genetic control, Genetic drift, Genetic engineering, Genetic polymorphism, Genetic variation, Geneticist, Genetics, Genic, Genic balance, Geniculate ganglion, Genital, Genital artery, Genital atrium, Genital bursa, Genital duct, Genital fold, Genital haemal strand, Genital opening, Genital operculum, Genital papilla, Genital passage, Genital plate, Genital pouch, Genital rachis, Genital ridge, Genital sinus, Genital stolon, Genital tubercle, Genital vein, Genitalia, Genito-intestinal canal, Genome, Genotype, Gentles (Maggots), Genu, Genus, Geobiont, Geocole (Geophile), Geographical distribution, Geographical isolation, Geographical range, Geological age, Geological distribution, Geological history, Geological record, Geological time, Geologist, Geometer moth, Geotactic, Geotaxis, Gephyrocercal, Germ, Germ cell, Germ gland (Gonad), Germ layer, Germ layer theory, Germ line (Germ track), Germ mass, Germ mother-cell, Germ plasm, Germ track (Germ line), Germ tube, Germ wall, Germarium, Germinal band, Germinal disc, Germinal disc (Blastodisc), Germinal epithelium, Germinal factor, Germinal unit, Germinal vesicle, Germinative layer, Germo-vitellarium, Gestalt, Gestation, Gestation period, Giant fibre, Giant nerve cell, Giantism, Giddiness, Gill, Gill bar, Gill books, Gill chamber, Gill cleft (Branchial cleft), Gill cover, Gill current, Gill filament, Gill lamella, Gill net, Gill parasite, Gill plate, Gill pouch, Gill raker

H

Habit, Habitat, Habitat selection, Habituation, Haddock, Haemal arch, Haematochrome, Haematocrit, Haematology, Haematuria, Haemerythrin, Haemo-endothelial, Haemochorial, Haemochorialis, Haemocoele, Haemocyanin, Haemoglobin, Haemolymph, Haemophilia, Haemopoiesis, Haemorrhage, Haemorrhoidal vein, Hag fish, Hair, Hair bulb, Hair follicle, Hair germ, Hair papilla, Hair pile, Hair shaft, Halation, Half hoop, Haliotis, Haliplankton, Hallux, Halobiont, Halocole, Halter shaped, Haltere, Hammerhead shark, Hamula, Hamulus, Hand, Hand picking, Haplodiploidy, Haploid (Monoploid), Haplotype, Haptotype, Hard dentine, Hard palate, Harderian gland, Hare-lip, Harmonious co-ordination, Harmonious correlation, Harvest mouse, Harvesting methods, Hatchery, Hatching, Hatschek's groove, Hatschek's nephridium, Hatschek's pit, Hatteria, Haustellum, Haversian canal, Haversian system, Havestman (Phalangida), Hawk, Hawkmoth, Head, Head capsule, Head fold, Head foot (Kopffuss), Head lobe, Head of femur, Head of humerus, Head plate, Head process, Head region, Head shield, Hearing, Heart, Heart attack, Heart beat, Heart rate centre, Heart water, Heat conservation, Heat treatment, Hectocotylization, Hectocotylus, Hedgehog, Heel bone, Heleoplankton, Helicotrema, Heliozoan, Helix, Helminth, Helminthic infection, Helminthologist, Helminthology, Heloderma, Helotism, Hemelytrum (Hemielytrum), Hemi-cephalous, Hemi-heterocercal, Hemi-metabola, Hemibranch, Hemichorda, Hemichordata, Hemichordate, Hemimetabolous, Hemimixis, Hemipelagic, Hemipelagic sediments, Hemiplacenta, Hemiptera, Hemipteran, Hemoblast, Hemoflagellates, Hemolytic amboceptor, Hemolytic anemia, Hensen's disc, Hensen's node, Hepatic, Hepatic artery, Hepatic caecum, Hepatic cell, Hepatic portal system, Hepatic portal vein, Hepatic sinus, Hepatic vein, Hepato-pancreas, Hepato-pancreatic duct, Heptaploid, Heptranchias, Herbivorous, Hereditary, Hereditary character, Hereditary material, Hereditary mechanism, Heredity, Heritable, Heritable characters, Hermaphrodite, Hermaphrodite duct, Hermaphrodite gland, Hermaphroditism, Hermit crab, Heron, Herring, Hesperornis, Hesperornithiformes, Hetero-myarian, Heterocercal, Heterocercal tail, Heterochromatic, Heterochromatic region, Heterochrony, Heterocoelous, Heterodont, Heterogamete, Heterogamy, Heterogenous, Heterogonic, Heterometabola (Exopterygota), Heterometabolous, Heteromorphic, Heteronemertini, Heteronereid, Heterophils, Heterophyid, Heteroplastic, Heteroploid (Aneuploid), Heterostraci, Heterotrichous, Heterotrophic, Heterozygote, Heterozygous, Hetrazan, Hexacanth, Hexacanth embryo, Hexactine, Hexactinellida, Hexactinian, Hexaploid, Hexapod, Hibernate, Hibernating, Hibernation, Hierarchy of categories, High density lipoproteins, High-crowned (Hypsodont), High-power (of a microscope), High-threshold, Hillock, Hilus, Hind-brain, Hind-gut, Hind-kidney, Hinge, Hinge joint

I

Ichthyopterygium, Ichthyornis, Ichthyornithiformes, Ichthyosauria, Iconotype, Icotype, Idiochromatin, Igneous rocks, Iguana, Ileal contents, Ileo-colic ring, Ileo-colic valve, Ileocaecal, Ileum, Iliac, Iliac artery, Iliac process, Iliac vein, Iliacus, Iliolumbar, Iliosciatic foramen, Ilium, Ill-adapted, Ill-effects, Image, Imaginal disc, Imago, Imagochrysalis, Immaturity, Immigrant, Immigration, Immobilization, Immune, Immune response, Immunity, Immunization, Immunized, Immuno suppression, Immunological reaction, Immunological strain, Immunological test, Immunology, Impair, Imperforate, Impervious, Impetigo, Impetus, Implantation (interplantation), Impotence, Impregnate, Impregnated, Impregnation, Imprinting, Impulse, In situ conservation, In utero, In vitro, In vitro culture (Explantation), In vitro fertilization, In vivo, In-cupped, Inapparent, Inbred line, Inbred race, Inbreeding, Incertae sedis, Incipient, Incipient ganglion, Incisiform, Incisive foramen, Incisive incisor, Inclusion body, Incompatibility, Incomplete, Incomplete dominance, Incomplete hoop, Incomplete linkage, Incomplete metamorphosis, Inconspicuous, Incubation (medical), Incubation (of egg), Incubation period, Incubator, Incurrent (Inhalent or afferent), Incus, Indeciduate, Independent effector, Indeterminate, Index - finger, Indian courser, Indicator species, Indigenous (Native), Indirect competition, Indirect division (Mitosis), Indiscriminate distribution, Individual genotype, Individuality, Individuation, Indophenol oxidase, Indrisinae, Induction, Induction shock, Industrial melanization, Ineffective reduction division, Ineffective stimulus, Inequilateral, Inequivalve, Inexhaustible resources, Infantilism, Infarction, Infection, Infective, Infective stage, Infectivity, Inferior jugular, Inferior jugular sinus, Inferior jugular vein, Inferior oblique, Inferior rectus, Inferior umbilicus, Inferior vena cava, Infero- marginal ossicle, Infertility, Infestation, Inflammation, Inflammatory infiltration, Inflammatory response, Inflected angle, Infra - basal, Infra - intestinal parietal ganglion, Infra foramen, Infra orbital gland, Infra ridge, Infra-order, Infraspecific, Infraspecific category, Infraspecific differences, Infraspecific organisation, Infrequent, Infundibular organ, Infundibulum, Infusion, Infusoria, Infusoriform embryo, Ingested, Ingestion, Ingestive tube, Ingrowth, Inguinal, Inguinal canal, Inguinal mammae, Inhalant (Afferent or incurrent), Inhalant pore, Inhalant siphon, Inherent (Hereditary), Inherent activity, Inherent condition, Inheritance, Inherited variation, Inhibit, Inhibition, Inhibitor, Inhibitory, Inhibitory effect, Inhibitory nerve, Inhibitory postsynaptic potential, Initial heat, Initiation, Initiation factor, Injection, Ink sac, Inland waters, Innate behaviour, Inner cell mass, Inner lip, Inner perihaemal canal, Innervation, Innocuous, Innominate, Innominate artery, Innominate bone, Innominate vein, Inoculation, Inscriptiones tendineae, Insect, Insect pest, Insecta, Insectivore, Insectivorous, Insemination, Insertion of muscle, Insidious, Insight learning, Insomnia, Inspiration, Inspiratory, Inspiratory reserve volume, Instar, Instinct, Insulating layer

J

J-disc, Jacobson's anastomosis, Jacobson's bone, Jejunum, Jelly - fish, Jerboa, Jerboa mouse, Joint-gill, Jugal, Jugal arch, Jugal lobe, Jugular, Jugular eminence, Jugular vein, Jugum, Juice, Jungle fowl, Juvenile, Juvenility factor

K

Kahn test, Kala-azar, Kangaroo, Karyogamy, Karyokinesis, Karyolymph (Nuclear sap), Karyoplasm (Nucleoplasm), Karyosome, Karyotype, Katabolism, Katadromous, Keber's organ, Keel (Carina), Keelback, Keimbahn (Germ line ; Germ track), Keratin, Keratinization, Keto-acid, Keto-substances, Ketogenic, Keyhole limpet, Keystone - piece, Keystone species, Kidney, Kidney duct, Kidney of accumulation, Kidney tubule, Kinaesthetic, Kinecamera (Cine camera), Kinematographic (Cinematographic) record, Kinesis, Kineto - nucleus, Kinetochore, Kinetoplast, King crow, King-crab, Kingfisher, Kinorhynch, Kiwi, Knee - jerk, Knob, Knob - like, Knobbed, Koala, Kolliker's pit, Kopffus (Head foot), Krait, Krause's membrane, Krebs' cycle

L

Labellum, Labia majora, Labia minora, Labial, Labial cartilage, Labial gland, Labial palp, Labial segment, Labium, Labrum, Labrum-epipharynx, Labyrinth, Labyrinthodont, Lac-insect, Lace-wing, Lacertilia, Lachrymal (Lacrimal), Lachrymal bone, Lachrymal duct, Lachrymal gland, Lachrymal secretion, Lacinia, Lactase, Lacteal, Lactic acid, Lactoflavine, Lactogenic, Lactose, Lacuna, Lacunar, Lacunar (or haemal) system, Lacunar (vascular) tissue, Lacustrine, Lagena, Lagomorpha, Lagomyidae, Lagoon, Lamarckism, Lamb, Lambdoidal crest, Lambdoidal suture, Lamella, Lamellibranch, Lameness, Lamina, Lamina perpendicularis, Lamina propria, Lamina terminalis, Laminar, Laminated, Laminated sheath, Lamprey, Lancelet (Amphioxus), Lancet, Lancet plate, Languet, Langur, Lantern coelom, Lanugo, Lapillus, Lappet, Lapping, Lapwing, Large black ant, Large brown ant, Large glutinents (Holotrichous isorhizas), Large intestine, Larva, Larva migrans, Larva of desor, Larval (provisional) seta, Larval arm, Larval membrane, Larval telson, Larvicide, Laryngeal, Laryngeal cartilages, Laryngeal chamber, Laryngo - tracheal chamber, Larynx (Voice box), Lassitude, Lasso, Lasso cell, Latebra, Latent period, Lateral, Lateral abdominal vein, Lateral cilia, Lateral cord, Lateral cutaneous, Lateral fold, Lateral ganglion, Lateral limiting fold, Lateral line canal, Lateral line canal system, Lateral line system, Lateral lobe, Lateral mesoderm (Hypomere), Lateral neural vessel, Lateral plate, Lateral plate mesoderm, Lateral ventricle (Prosocoel), Lateral zooid, Laterofrontal, Laterofrontal cilia, Laterofrontals (ref. Skull), Latissimus dorsi, Lattice, Laurer's canal, Law of independant assortment, Law of segregation, Layer (stratum), Leaf - insect, Leafcutter, Learning behaviour, Leather-backed jacket, Leather-backed turtle, Lecithin, Lectoallotype, Lectotype, Leech, Left common carotid artery, Left subclavian artery, Leishman body, Leishmania, Leishmanial tissue stage, Leishmaniasis, Lemming, Lemniscus, Lemur, Lemuroid, Lemuroidea, Lens, Lens capsule, Lentic (Lenitic), Lepidoptera, Lepidopterous, Lepidotrichia, Leporidae, Leptocephalus, Leptomonad, Leptospiras, Leptospirous, Leptotene, Lesion, Lesser coverts, Lesser trochanter, Lesser tuberosity, Lethal, Lethal gene, Leucocyte (White corpuscle), Leucosin, Levator, Levator scapulae, Level of significance, Leydig's gland, Liassic period, Lieberkuhn follicle, Lienogastric artery, Lienogastric vein, Life cycle, Life expectancy, Life history, Life process, Ligament, Ligamentous band, Ligamentum nuchae, Ligature, Light-absorbing, Light-dispersing, Light-induced, Ligula, Limaciform, Limax, Limax amoeba (Limaciform amoeba), Limb, Limb bud, Limb girdle, Limb segment, Limb skeleton (Appendicular skeleton), Lime cells, limestone, Liminal, Limiting fold, Limiting sulcus, Limnetic, Limnoplankton, Limpet, Limulus, Line alba, Line of evolution, Line of growth, Lineage, Linear, Lingua, Lingual, Lingual artery, Lingual cartilage, Lingual ribbon, Lingual vein

M

Mabuia, Macaque, Macaw, Maceration, Machado reaction, Mackerel shark (Mako), Macro - evolution, Macro - mutation, Macrogamete, Macrogametocyte, Macrolecithal (Megalecithal), Macromere, Macromolecule, Macronephridium, Macronucleus, Macronutrient, Macrophage, Macrophagous, Macrophagous feeder, Macroplankton, Macrosmatic, Macrosmatism, Macrospheric, Macrosynapse, Macruran, Macrurid, Macrurous type, Macula, Macula lutea, Macula statica, Maculae acousticum, Madreporic canal, Madreporic vesicle, Madreporite, Magellania, Maggot, Maggot-like, Mako shark (Mackerel shark), Malacostraca, Malaise, Malar bone, Malaria, Malaria-carrying, Male, Male pores, Male pronucleus, Male-determining factor, Malformed, Malignant tertian fever, Malignant tumor, Malleus, Mallophaga, Malnutrition, Malpighian body, Malpighian capsule, Malpighian layer, Malpighian tubule, Malpighii stratum, Maltase, Maltose, Mamma, Mammal, Mammalia, Mammalian, Mammary foetus, Mammary gland, Mammoth, Man eater shark, Man- like ape, Manatee, Mandible, Mandible bone, Mandibular, Mandibular arch, Mandibular segment, Mandibular vein, Manducation (Mastication), Mangrove, Manipulation, Manis, Mantle cavity, Mantle flap, Manubrium, Manubrium of sternum, Manus, Manx cat, Mapping out, Margin of overgrowth, Marginal, Marginal anchor, Marginal belt, Marginal lappet, Marginal plate, Marginal sense organ, Marginal tentacle, Marginal vesicle, Marine, Marine borer, Marker gene, Markings, Marmoset, Marrow (of bone), Marrow cavity, Marsh, Marsupial, Marsupial bone, Marsupial mole, Marsupial mouse, Marsupial wolf, Marsupialia, Marsupium, Mask, Masked, Mass intermedia (middle or third commissure), Masseter, Mast cell, Mastax, Masticate, Mastication, Masticator (jaw), Mastigobranch, Mastigont, Mastigophora, Mastodont, Mastoid, Mastoid portion, Mastoid process, Maternal placenta, Mating reaction, Mating type, Matrix, Matted, Maturation, Mature, Maurer’s dots, Maxilla (i.e. Maxillary appendage in invertebrates), Maxilla (in vertebrates), Maxillary (bone), Maxillary antrum (Maxillary sinus), Maxillary palp, Maxillary segment, Maxillary stylet, Maxilliped, Maxillo turbinal, Maxillo-palatine process, Maxillula, Maximum economic yield, Maximum sustainable level, May-fly, Maze-running, Mealy bug, Mean sum, Mean value, Measly, Meatus venosus, Mechanical, Mechanical sense, Mechanism, Mechanism of inheritance, Mechanocyte, Mechanoreceptor, Meckel's cartilage, Mecoptera, Median, Median coverts, Median eye, Median fin, Median fissure, Median furrow, Median olfactory lobe, Median sacral (caudal), Median sense organ (Pineal sense organ), Median zooid, Mediastinum, Mediastinum testis, Medulla, Medulla oblongata, Medulla testis, Medullary, Medullary fold, Medullary groove, Medullary keel, Medullary plate, Medullary sheath, Medullated nerve fibre, Medusa, Medusoid, Medusoid bud (Medusa-bud), Mega- evolution, Megachromosome, Megagamete, Megagametocyte, Megalecithal (Macrolecithal), Megalopa stage, Megaloplankton, Megalospheric, Megamere, Meganephridium, Meganucleus, Mehli's gland

N

Nabrix, Nacre (Nacreous), Nacreous layer, Nagana, Nail, Nanoplankton, Narcotized, Naris ; Nares (pl), Narrow specialisation, Narrow waist (Petiole), Narwhale, Nasal, Nasal bone, Nasal cavity, Nasal septum, Nasal sinus, Naso-buccal groove, Naso-hypobasal, Naso-palatine, Naso-pharynx, Naso-turbinal, National parks, Native species, Natural, Natural barrier, Natural classification, Natural killer cell, Natural science, Natural selection, Naturalist, Naturalistic theory, Naturalized, Nature Corridors, Nauplius, Nauplius larva, Nautiloid, Nautiloidea, Nautilus, Navicular, Nearctic form, Neck, Neck feedback, Neck gland, Neck muscles, Neck of femur, Neck of tooth, Neck organ, Nectocalyx, Nectochaete, Needham's sac, Negative character, Nekton, Nematoblast (Cnidoblast), Nematocyst (Cnidocyst), Nematoda, Nematode, Nematogene, Nematophore, Nemertea, Nemertine, Neognathae, Neonychium, Neopallial region, Neopallium, Neornithes, Neosporidia, Neoteny, Neotropical, Nephric, Nephridial, Nephridiopore, Nephridiostome, Nephridium of Hatschek, Nephroblast, Nephrocoel, Nephrocoelar chamber, Nephrocyte, Nephrogenous, Nephromixium, Nephron, Nephroperitoneal duct, Nephrostome, Nephrotome, Neritic, Nerve, Nerve beginning, Nerve branch, Nerve cell, Nerve chain, Nerve collar, Nerve complex, Nerve cord, Nerve endings, Nerve fibre, Nerve impulse, Nerve matter, Nerve net, Nerve pentagon, Nerve plexus, Nerve ring, Nervous layer, Nervous system, Nervous tissue, Nervure, Nervus terminalis, Nestling downs, Network, Neural, Neural arch, Neural canal, Neural crest, Neural fold, Neural groove, Neural plate, Neural spine, Neural tube, Neural vessel, Neurenteric canal, Neurilemma, Neuro-muscular junction, Neuro-sensory system, Neuroblast, Neurocoel, Neurocranium, Neurocyte, Neurofibril, Neuroglia, Neurohumours (Neurohormones), Neurohypophysis, Neuroid transmission, Neuromast organ, Neuromast system, Neuromere, Neuromotor apparatus, Neuromotor system, Neuron, Neuroneme, Neuronephroblast, Neuropodium, Neuropore, Neuroptera, Neuropterous larva, Neurosensory cell, Neurotransmitter, Neurotropic ; Neurotrophic, Neurula, Neurulation, Neuston, Neuter - worker, Neutral, Neutral polymorphism, Neutrophils, New differentiation, Newt, Niacin, Niche, Nicoria, Nicotinic acid, Nictitating membrane, Nidamental gland, Night - blindness, Night - jar, Nightingale, Nipple, Nissl's granule, Nitrogenous, Nitrogenous excretion, Nocturnal, Node (Nodus), Node of Ranvier, Nodule, Nomenclature, Nomogram, Non-adaptive, Non-biological factor, Non-cellular, Non-chordate, Non-contractile, Non-deciduate, Non-deciduate placenta, Non-dialysable, Non-endemic, Non-eversible, Non-existence, Non-fertile, Non-ganglionated, Non-genetic, Non-immune, Non-immunizing, Non-inheritable, Non-living, Non-medullated, Non-migrants, Non-motile, Non-mutated, Non-nervous, Non-operative, Non-pathogenic, Non-periodic, Non-precocious (of birds)

O

Obelia, Obelion (of skull), Obligatory, Obligatory parasite, Oblique, Oblique muscle, Oblique septum, Oblique sternal muscle, Obliques, Obliquus externus, Obliquus internus, Obliterative shading, Obnoxious, Obscure, Observed frequency, Observed value, Obsolescence, Obsolete, Obtect pupa, Obtected, Obturator fissure, Obturator foramen, Obturator internus, Obturator notch, Obtusilingues, Occipital, Occipital bone, Occipital condyle, Occipital crest, Occipital region, Occipital ring, Occipito-otic, Occipito-vertebral artery, Occiput, Occlusion, Occlusor muscle, Oceanic, Ocellus, Octaploid, Octopod, Octopoda, Octopus, Oculars (Ocular plates), Oculomotor, Oculomotor nerve, Odonata, Odontoblast, Odontoid process, Odontophore, Odoriferous, Odour, Oegopsida, Oenocyte, Oesophageal, Oesophageal artery, Oesophageal bulb, Oesophageal connective, Oesophageal diverticulum, Oesophageal gland, Oesophageal pouch, Oesophageo - cutaneous duct, Oesophagus, Oestradiol, Oestriol, Oestrogenic, Oestrone, Oestrous (estrous), Oestrous cycle, Oestrous producing hormone, Offence, Offshoot, Offspring, Oil gland, Olecranon fossa, Olecranon process, Oleocyst, Olfactory, Olfactory bulb, Olfactory capsule, Olfactory cell, Olfactory foramen, Olfactory fossa, Olfactory hair(Aesthetasc), Olfactory lobe, Olfactory nerve, Olfactory organ, Olfactory penduncle, Olfactory pit, Olfactory sac, Olfactory tract, Oligochaeta, Oligohaline, Oligolecithal (Microlecithal ; Meiolecithal), Oligopod stage, Oligotrophic, Oligotrophic water, Olivary body, Olynthus, Omentum, Ommatidium, Ommatophore, Omnivorous, Omosternum, Onchocerciasis, Onchosphere, Oncidium, Oncogene, One-way conduction, Ontogeny, Onychophora, Oocyst, Oocyte, Ooecium (Ovicell), Oogamy, Oogenesis, Oogonium, Ookinete, Oophorectomy, Oostegite, Oostegopod, Ootheca, Ootid, Ootype, Ooze, Opalescent, Opalinid, Open cavity, Opercular aperture (Spiracle), Opercular plug, Operculated, Operculum, Ophidia, Ophiocoma, Ophiopluteus, Ophiothrix, Ophiura, Ophiuroid, Ophiuroidea, Ophthalmic, Ophthalmic artery, Ophthalmic branch, Opisthobranchiate, Opisthocoelous, Opisthocomus, Opisthosoma, Opisthotic, Opisthotic bone, Opossum, Opposable thumb, Opsonification, Optic, Optic chiasma, Optic cup, Optic foramen, Optic ganglion, Optic gland (White body), Optic lobe, Optic nerve, Optic rod (Rhabdome), Optic stalk, Optic thalamus, Optic vesicle, Optimal condition, Optocoele, Ora serrata, Oral (actinal), Oral arm, Oral cirrus, Oral cone, Oral disc, Oral gland, Oral groove, Oral hood, Oral lobe, Oral passage, Oral ring - vessel, Oral sucker, Oral tentacle, Orang Utan, Orbicular, Orbiculate, Orbit (of eye), Orbital, Orbito - ethmoidal, Orbitosphenoid (bone), Order, Ordovician, Organ, Organ - pipe coral, Organ - specific areas, Organ field, Organ forming areas, Organ forming substances, Organ of Bojanus, Organ of Corti, Organ of equilibration, Organ of Jacobson, Organ of Owen, Organ of propulsion, Organ of special sense

P

Pacemaker, Pacinian corpuscles (bodies), Packed Cell Volume (PCV), Packet, Packing tissue, Paddle shaped, Paddy bug, Paedogamy, Paedogenesis, Paedomorphosis, Painted snipe, Paired eyes, Paired fins, Palaearctic, Palaearctic bird, Palaeognathae, Palaeonemertini, Palaeontological data, Palaeontological evidences, Palaeontological evolution, Palaeontological fauna, Palaeontology, Palaeopallium, Palaeozoic, Palate, Palatine, Palatine bone, Palatine teeth, Palato - pterygo - quadrate bar, Palato - quadrate bar, Palingenesis, Palingenetic, Pallial cavity, Pallial complex, Pallial gill, Pallial groove, Pallial line, Pallial mucous - gland, Pallial sinus, Palliovisceral, Pallium, Pallor, Palmar, Palmar sesamoid, Palmate, Palmella, Palolo worm, Palp, Palpal organ, Palpifer (Palpiger), Palpitaton, Paludina, Palus, Pancreas, Pancreatic duct, Pancreatic juice, Pandalus, Pangolin, Panmictic population, Panmixia, Pansporoblast, Papilla, Papula, Parabasal, Parabasal body, Parabiont, Parabiotic, Parabiotic twins, Parabranchia, Paracentric inversion, Parachordal, Paracoele, Paracone, Paraconid, Paradidymis, Parafibula, Paragaster, Paragastric, Paragastric cavity, Paraglossa, Paragnath, Parakeet, Paralectotype, Paralimnic, Parallel evolution, Paramitosis, Paramylum, Paranephric, Paranephrocyte, Paranucleus (Nebenkern), Paraoesophageal connective, Parapet, Paraphysis, Parapineal organ, Parapodial muscles, Parapodium, Parapophysis, Paraproct, Parapsid, Parapsida, Parasagittal section, Parasematic, Parasite, Parasitic castration, Parasitism, Parasitization, Parasitized, Parasitizing, Parasitoid, Parasitologist, Parasphenoid, Parasympathetic, Paratergite, Parathormone, Parathyroid, Parathyroid hormone (PTH), Paratype, Paraxonic, Parazoa, Parchment, Parencephalon, Parenchyma, Parenchyma muscle, Parenchymatous tissue, Parenchymula, Parent, Parental, Parental care behaviour, Parenteral phase, Parietal, Parietal bone, Parietal layer, Parietal muscle, Parietal recess, Parietal ring, Parieto-splanchnic, Parieto-vaginal muscles, Paroccipital, Paroccipital process, Paroophoron, Parotic process, Parotid gland, Parovarium, Parrot, Pars, Pars anterior, Pars buccalis, Pars intercerebralia, Pars intermedia, Pars nervosa, Pars tuberalis, Parthenogenesis, Parthenogenetic, Partial, Partial biological discontinuity, Partial linkage, Partial pressure, Partition, Partridge, Parturition, Partuterine, Partuterine organ, Passerine bird, Passive, Pasteurization, Pastoral, Pasture, Patagium, Patella, Patella ulnaris, Patellar groove, Patellar tendon, Pathetic nerve (Patheticus), Pathogen, Pathogenic, Pathogenic threshold, Pathogenicity, Patobiont, Pattern of behaviour, Paunch (Rumen), Pavement epithelium, Pear - shaped, Pearl - mussle, Pebrine, Peccary, Peck, Pecten (Ctenidium), Pecten maximus, Pecten opercularis, Pectinate, Pectineal process, Pectines (plu.), Pectineus, Pectinibranchiata, Pectoral, Pectoral arch, Pectoral fin, Pectoral girdle, Pectoralis, Pectoralis major

Q

Quadrant, Quadrat, Quadrate, Quadrato-jugal, Quadri-nucleate, Quadri-tubercular, Quadriurate, Quadruped, Quadrupedal, Quail, Quantal summation, Quantitative control, Quantitative process, Quartan fever, Quasi-segment, Queen (of insect colonies), Quiescent stage, Quill feather, Quincuncial arrangement, Quinine, Quinque - tubercular, Quotidian, Quotidian fever

R

Rabbit, Raccoon, Race, Racemose vesicle (Tiedemann's vesicle), Rachiglossa, Rachis, Rachitomous, Radial, Radial ambulacral vessel, Radial canal, Radial cartilage, Radial cleavage, Radial nerve, Radial perihaemal strand, Radial perihaemal vessel, Radial styloid process, Radial symmetry, Radiale, Radialia, Radials (of fin-rays), Radials (Radial plates), Radiating lamella, Radiating tubule, Radio-ulna, Radioactivity, Radiobiology, Radiolarian, Radiolarian ooze, Radiology, Radioreceptor, Radius (sing), Radii (plu.), Radius bone, Radula, Radula sac, Raft-like sternum, Ramify, Ramus (sing), Rami (plu), Ramus communicans, Ramus ophthalmicus profundus, Ramus ophthalmicus superficialis, Ranch, Rancid fats, Random breeding, Random differentiation, Random sampling, Randomness, Raptorial organ, Rare species, Rat, Rat - flea, Rat - like marsupial, Rat - snake, Rat kangaroo, Rate gene, Rates of evolution, Rathke's pouch, Raticide, Ratitae, Rattlesnake, Rauber's cell, Rauber's layer, Ray, Ray (the fish), Razor shell, Re-adaptation, Re-encapsulated, Re-encysted, Reabsorbed, Reabsorption, Readjustment, Reagin, Recapitulation, Recapitulation theory, Recent, Receptaculum chyli, Receptaculum ovorum, Receptaculum seminis (Spermatheca), Receptor, Receptor cell, Receptor neuron, Receptor organ, Recess, Recessed, Recessed nasal, Recessive, Recessive characters, Recessive gene, Recessive mutation, Recessiveness, Reciprocal fertilization, Recognition mark, Recombinant, Recombinant DNA Technology, Recombination, Recovery stroke, Recrudescence, Rectal, Rectal caecum, Rectal gland, Rectigradation, Rectrices (Rectrix), Rectum, Rectus (muscle), Rectus abdominis, Recumbent position, Recurrent, Recurrent laryngeal nerve, Recurrent mutation, Recurring, Recyclable resources, Red - snows, Red ant, Red blood corpuscle, Red body, Red bone marrow, Red breast, Red gland, Red wattled lapwing, Red weevil, Redia, Redirected behaviour, Reduction division (Disjunction Division), Reduplicate, Reduplicated, Reduplication, Redwater fever, Reef, Refection (Pseudorumination), Reflex, Reflex action, Reflex arc, Reflex response, Refractile, Refractile bodies, Refractile ring, Refractive, Refractoriness, Refractory period, Refringent, Regeneration, Regrafted, Regression, Regulation, Regulation type (Indeterminate type), Regulatory mechanism, Regurgitate, Regurgitating, Regurgitation, Reindeer, Reinfection, Reinforcement, Reinvade, Reissner's membrane, Rejuvenation, Rejuvenescence, Relapse, Relapsing fever, Related community, Related line, Related species, Relatedness, Relationship, Relative growth - constant, Relaxation, Relict, Relict species, Remains, Remex (Remige ; wing quill), Renal, Renal artery, Renal cortex, Renal medulla, Renal organ, Renal pelvis, Renal portal system, Renal portal vein, Renal reproductive, Renal tubule, Renal vein, Rennet stomach, Rennin, Renopericardial canal, Reorganization, Repeated fission, Repellance, Repellent, Replacing bone (Cartilage bone), Repletion, Repressor gene (inhibitor gene), Reproduction, Reproductive (Genital), Reproductive system, Reproductive zooid, Reptile, Researcher, Reserve fang, Reservoir, Resident bird, Residual air, Residual effect

S

Sabellid, Sabre shape, Sabre toothed, Sac (Saccus), Saccular organ, Saccule (Sacculus), Sacculina, Sacculus endolymphaticus, Sacculus rotundus, Saccus endolymphaticus, Saccus vasculous, Sacral, Sacral plexus, Sacral rib, Sacro-vertebral angle, Sacrum, Saefftigen's pouch, Sagitta (a statolith), Sagittal crest, Sagittal plane, Sagittal section, Saki, Salamander, Salamandrine, Saline, Saline smear, Salinity, Saliva, Salivary, Salivary gland, Salivary receptacle, Sallow, Salmon, Salt impregnation, Saltation, Saltatoria, Saltatorial, Saltatory conduction, Salticidae, Sampling, Sanctuaries, Sand bar, Sand fly, Sand piper, Sand shark, Saponification, Saponified, Saprophagous, Saprophyte, Saprophytic, Saproplankton, Saprozoic, Sarcolemma, Sarcomere, Sarcophilus, Sarcoplasm, Sartorius, Saturated fat, Saucer - shaped, Saw-scaled viper, Sawfish, Sawfly, Scab, Scabies, Scala media, Scala tympani, Scala vestibuli, Scale, Scale (of fish), Scale insect, Scalloped, Scallops, Scalp, Scalpel, Scaly ant-eater, Scansorial birds, Scape, Scapho-lunar, Scaphocerite, Scaphognathite, Scaphoid, Scaphoid bone, Scaphopoda, Scapula, Scapular region, Scapulars, Scapulo - coracoid, Scavenger, Scent gland, Scent scale, Schaudinn's fluid, Schema, Schismogenesis, Schistosomiasis, Schizocoele, Schizognathous, Schizogonic, Schizogonic cycle, Schizogonous, Schizogony (Merogony), Schizont, Schizonticide, Schizozoite (Merozoite), Schneiderian membrane, Schunner's dots, Sciatic, Sciatic artery, Sciatic nerve, Sciatic plexus, Sciatic vein, Sciatica, Scientific method, Sciuroidea, Sciuromorpha, Sclerite, Scleroblast, Sclerotic bony plate, Sclerotic coat, Sclerotic layer (sclera), Sclerotized, Sclerotome, Scolex, Scolopale, Scoloparia (Chordotonal organ), Scolophore, Scorpion, Scorpion fly, Scraping, Screw propeller, Screw worm, Scroll - like, Scroll bone, Scrotal sac (Scrotum ; Testis sac), Scute, Scutellar, Scutellum, Scutum, Scyphistoma, Scyphozoan polyp, Sea anemone, Sea butterfly, Sea cow, Sea cucumber, Sea dollar, Sea gull, Sea hare, Sea horse, Sea lemon, Sea lily, Sea mussle, Sea slug, Sea snake, Sea squirt, Sea star, Sea urchin, Sea weed, Seal, Seasonal reservoirs, Sebaceous gland, Sebum, Second filial generation, Second maxilla, Second maxilliped, Second polar body, Second radial plate, Secondaries (Cubitals), Secondary, Secondary cranium, Secondary host, Secondary immune response, Secondary integration, Secondary mesentery, Secondary optic vesicle, Secondary radials, Secondary sexual characters, Secretin, Secretion, Secretory, Secretory tubule, Sectional teeth (carnassial teeth), Sectorial, Sedentary, Sedimentary rock, Sedimentation, Seessel's pouch (Pre-oral gut), Segment, Segmental, Segmental artery, Segmental duct, Segmental organ, Segmentation, Segmentation (Cleavage), Segmentation cavity (Blastocoel), Segmented, Segregation, Segregation of characters, Selachian, Selachian pattern, Selective advantage, Selective permeability

T

Tabanid, Tabby cat, Tabula, Tachygenesis, Tachytelic, Tactile, Tactile cell, Tactile organ, Tactile rod, Tactile stimulus, Tadpole, Tadpole stage, Taenia hippocampi, Taeniodonta, Taenioglossa, Taeniole, Tagma, Tail, Tail fan, Tail feather, Tail fluke, Tail foot (Uropod), Tailor bird, Tangential line, Tanylobous, Tape-worm, Tapering, Tapetal layer, Tapetum cellulosum, Tapir, Tarantula, Tarsal bone, Tarsal gland, Tarsale, Tarso-metatarsus, Tarsus, Taste, Taste bud, Taxis, Taxonomy (Systematics ; Classification), Teal, Teat, Technique, Tectorial membrane, Tectrices, Tectrix (Covert), Tectum opticum, Tegmen (of insects), Tegmentum, Telemetacarpal, Telencephalon, Teleodont, Teleological, Teleology, Teleost, Teloblast, Telodendrion, Telolecithal, Telophase, Telotaxis, Telotrochal larva, Telson, Telson caudal, Temperature, Temporal bone, Temporal lobe, Temporal vacuity, Tendinous, Tendinous centre, Tendon, Tensor tympani, Tensores patagii, Tentacle, Tentacle-sheath, Tentacular canal, Tentacular fold, Tentacular nerve, Tentaculated, Tentaculocyst, Tentorial, Tentorium, Teratogen, Teratogenic, Teratology, Terebellid, Tergite (Tergum), Tergo-sternal muscle, Tergum (Tergite), Terminal, Terminal arborisation, Terminal bronchiole, Termite, Terramycin, Terrestrial, Territoriality, Territory, Tertian fever, Tertiaries, Tertiary mesentery, Tessellate, Tessellated epithelium, Test (Tunic), Test cell, Test cross, Testicardines, Testis, Testis sac, Testosterone, Tetanic spasm, Tetanus, Tetrabranchiate, Tetractine, Tetrad, Tetraploid, Tetrapod, Tetrapoda, Tetraradiate, Tetraxon, Tetraxon spicule, Tetrazooid, Tetrosomy, Thalamencephalon, Thalamo-cortical tract, Thalamus, Thebesian valve, Theca, Thecodont, Thecoidea, Thelycum, Theory of special creation, Therapeutic, Therapeutic efficacy, Therapy, Thermocline, Thermolabile, Thermoreceptor, Thiamin, Thiazole, Thigh, Thigh bone (Femur), Thigmotaxis, Thimble-shaped, Third bronchus, Third commissure, Third maxilliped, Third order, Third trochanter, Third ventricle, Thoracic, Thoracic duct, Thoracic gland, Thoracic limb, Thoracic somite, Thoracico - abdominal rudiment, Thorax, Thread-worm, Three-day fever, Three-rayed, Three-toed, Three-toed sloth, Threshold, Threshold of excitability, Threshold reaction, Threshold stimulus, Threshold substance, Thrip, Thrombin, Thrombocyte, Thrombokinase, Thymus, Thyroglossal duct, Thyrohyal, Thyroid, Thyroid cartilage, Thyroid gland, Thyroid stimulating hormone (TSH), Thyroidetomized, Thyrotrophic factor, Thyrotrophic hormone, Thyroxine, Thysanoptera, Tibia, Tibia (in insects), Tibial border, Tibial element, Tibiale, Tibio-fibula, Tibio-tarsus, Tick, Tidal air, Tidal flat, Tidal rhythm, Tidal volume, Tidal zone, Tiedemann’s body, Tiedemann’s vesicle (Racemose vesicle), Tiger-beetle, Time relation, Tint, Tissue

U

U-Shaped, Ulceration, Ulna, Ulnare, Ultra bar, Ultra violet radiation, Ultrafiltration, Ultraplankton, Umbilical, Umbilical artery, Umbilical cord, Umbilical stalk, Umbilical vein, Umbilical vesicle, Umbilicus, Umbo, Umbrella species, Unarmed scolex, Unassimilated, Unbalanced, Unciform (Uncinate), Unciform bone, Unciliate, Uncinus, Unconditioned reflex, Unconstricted, Uncoordinated, Uncus, Under tail-covert, Under wing-covert, Under-activity, Undernourished, Undifferentiated, Undulating, Undulating membrane, Undulating movement, Undulation, Unequal, Unfossilized, Ungual phalanx, Unguiculate, Unguis, Ungulata, Ungulate, Unguligrade, Unhatched, Uni-modal curve, Unification, Uniform, Unilateral, Unipolar, Unipolar nerve cell, Uniramous, Uniserial, Unitary impulse, Universal donor, Universal recipient, Unmasticated, Unmutated, Unossified, Unpaired, Unpigmented, Unrelated stock, Unsanitary, Unsegmented, Unspined, Unstriated, Unstriped, Unstriped (unstriated) muscle, Unsymmetrical, Upper arm, Upper extremity, Upper jaw, Upper tail covert, Upper wing covert, Urachus, Urea, Ureotelic, Ureter, Urethra, Uric acid, Uricotelic, Urinalysis, Urinary duct, Urinary opening, Urinary papilla, Urinary passage, Urinary sinus, Urinary tube, Urinary tubule, Urine, Uriniferous tubule, Urinogenital, Urinogenital aperture, Urinogenital canal, Urinogenital chamber, Urinogenital duct, Urinogenital papilla, Urinogenital system, Urinogenitalsinus, Urn, Urocardiac ossicle, Urochordata, Urochordate, Urodaeum, Urogenital (Urinogenital), Urohyal, Uropod, Uropygium, Urosome, Urostyle, Urticator (Nematocyst), Uterine, Uterine bell, Uterine crypt, Uterine milk, Uterine pore, Uterus, Uterus duplex, Uterus masculinus, Uterus simplex, Utricle, Utriculus, Uvula

V

Vaccine, Vacuity, Vacuolated body, Vacuolated cell, Vacuole, Vagina, Vagus (nerve), Vagus foramen, Vagus ganglion, Valvate, Valve, Valve of Thebesius, Valve of Vieussens, Valvula cerebellum, Valvular cornus, Vane, Variant, Variation, Variety, Vas deferens, Vas efferens, Vascular, Vascular area, Vascular layer, Vascular system, Vascular villus, Vasectomy, Vaso-ganglion, Vasoconstriction, Vasodentine, Vasodilatation (Vasodilation), Vasomotor, Vasopressin, Vector, Vegetal hemisphere, Vegetal pole, Vegetative, Vein, Velar plate, Velar tentacle, Velarium, Veliger, Velum, Velum interpositum, Velum transversum, Vena cava, Venation, Venereal diseases, Venom, Venomous snake, Venous blood, Venous system, Vent (Anus), Ventilation, Ventral, Ventral aorta, Ventral cirrus, Ventral cord, Ventral fin, Ventral flexure, Ventral ladder, Ventral mantle lobe, Ventral shield, Ventral valve, Ventricle (of brain), Ventricle (of heart), Ventriculographic X-ray, Ventro-intestinal, Ventro-lateral, Ventro-parietal, Venule, Veratrin, Vermicule, Vermiform, Vermiform appendix, Vermiform embryo, Vermis, Vertebra, Vertebral column, Vertebral rib, Vertebrarterial canal, Vertebrarterial foramen, Vertebrata, Vertebrate, Vertex, Vertical, Vertical distribution, Vertical prism, Vesicle, Vesicle of Savi, Vesicula seminalis, Vesicular, Vesicular duct, Vesicular gland, Vesiglandin, Vessel, Vestibule, Vestige, Vestigial structure, Vexillum, Viability, Viable, Viable gamete, Vibraculum, Vibratile corpuscle, Vibration, Vibrissa, Villus, Viper, Virgula, Virologist, Virulence, Virulent, Virus, Viscera, Visceral, Visceral arch, Visceral cleft, Visceral ganglion, Visceral groove, Visceral hump, Visceral layer, Visceral loop, Visceral mass, Visceral motor, Visceral muscle (Plain muscle), Visceral nerve, Visceral nervous system, Visceral pouch, Visceral sensory, Visceral skeleton, Visceral strain, Visceral system, Viscerallacuna, Viscero - sensory, Viscid, Viscid mucous, Viscid secretion, Vision (sight), Visual, Visual acuity, Visual association area, Visual purple, Visual sensory area, Vital activity, Vital capacity, Vital process, Vitalism, Vitalistic, Vitamin, Vitellarium, Vitelline, Vitelline artery, Vitelline gland, Vitelline membrane, Vitelline vein, Vitrella, Vitreous, Vitreous body, Vitreous chamber, Vitreous humour, Vitrodentine, Viviparity, Viviparous, Vocal cord, Vocal sac, Volant, Vole, Voluntary, Voluntary muscle, Voluntin, Volvent, Vomer, Vomerine tooth, Vomero - nasal organ, Vomit, Vulture, Vulva

W

Wag tail, Waggle dance, Walking leg, Walking pattern, Wall-gill (Pleurobranch), Wallaby, Waltzing, Wandering cell, Wandering macrophage, Warble, Warble fly, Warbler, Warm-blooded, Warning” pattern, Warty, Wasp, Water beetle, Water boatman, Water breathing, Water bug, Water flea, Water fowl, Water hen, Water monitor, Water pore, Water sac, Water scorpion, Water tube, Water vascular, Water vascular ring, Water vascular system, Wave summation, Wax-forming gland, Weapon of offence, Weathering, Weaver bird, Web, Weberian ossicle, Weevil, Wegener's theory, Whale, Whalebone (Baleen), Wheel animalcule, Wheel organ, Whelk, Whip-like, Whip-like tail, Whip-snake, Whip-worm, Whirling beetle, Whistling teal, White Blood Cell Count, White body (Optic gland), White corpuscle, White Differential Count (WBC/DC), White fibre, White fibrous tissue, White matter, Whiting, Wild-type gene, Wing, Wing bud, Wing case, Wing coupling, Wing membrane, Wing muscle, Wing pad, Wing pattern, Wing quill (Remige), Wing rudiment, Winkles, Winter eggs, Wire - worm, Wizened, Wolf spider, Wolffian body, Wolffian duct, Wombat, Wood ant, Wood louse, Wood pecker, Wood pigeon, Worker (of insect colonies), Working caste, World heritage, Worm, Worm Hook, Worm Round, Worm Tape, Wormian bone, Wriggling, Wright's theory of drift, Wrinkles, Wrist

X

X-chromosome, X-ray, Xanthophore, Xanthoplast, Xenodiagnosis, Xenoplastic, Xerophthalmia, Xiphisternal cartilage, Xiphisternum, Xiphoid, Xiphosura

Y

Y-chromosome, Yawing, Yaws, Yeast, Yellow cell, Yellow elastic tissue, Yellow fibre, Yellow spot, Yellow stem borer, Yellow wattled lapwing, Yellowfever, Yolk, Yolk (Deutoplasm), Yolk cells, Yolk duct, Yolk glands, Yolk granules, Yolk nucleus complex, Yolk plug, Yolk sac, Yolk sac placenta, Yolk spherule, Yolksac umbilicus

Z

Z-disc, Zalambdodont, Zebra, Zigzag muscle segment, Zigzagged serrations, Zoantharian, Zoea, Zoeaform, Zona granulosa, Zona pellucida, Zona radiata, Zonary placenta, Zone, Zone of junction, Zones of hybridisation, Zoo-geographic regions, Zoo-geography, Zoochlorella, Zooecium, Zooid, Zoological systematics, Zoology, Zoomastigophora, Zoophilic, Zoophilic strain, Zoophyte, Zooplankton, Zygantrum, Zygapophysis, Zygocardiac ossicle, Zygomatic, Zygomatic arch (Zygoma), Zygomatic bone, Zygosphene, Zygote, Zygote nucleus, Zygotic nucleus, Zygotogenesis (Fertilization)

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