1.  amphibian(n = noun.artifact) amphibious vehicle - a flat-bottomed motor vehicle that can travel on land or water;
is a kind of automotive vehicle, motor vehicle
has particulars: marsh buggy, swamp buggy

2.  amphibian(n = noun.artifact) amphibious aircraft - an airplane designed to take off and land on water;
is a kind of aeroplane, airplane, plane
has parts: pontoon

3.  amphibian(n = noun.animal) - cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form;
is a kind of craniate, vertebrate
has parts: lateral line, lateral line organ
is a member of amphibia, class amphibia
has particulars: hynerpeton bassetti, ichyostega, caudate, urodele, salamander, anuran, batrachian, frog, salientian, toad, toad frog, blindworm, caecilian, labyrinthodont
Derived form adjective amphibian₁

   amphibian(a = adj.pert) amphibious - relating to or characteristic of animals of the class Amphibia;
Derived form noun amphibian₃

   Of or pertaining to the Amphibia; as, amphibian reptiles. [1913 Webster]

   One of the Amphibia. [1913 Webster]

amphibian, adj. & n.
--adj.
1 living both on land and in water.
2 Zool. of or relating to the class Amphibia.
3 (of a vehicle) able to operate on land and water.
--n.
1 Zool. any vertebrate of the class Amphibia, with a life history of an aquatic gill-breathing larval stage followed by a terrestrial lung-breathing adult stage, including frogs, toads, newts, and salamanders.
2 (in general use) a creature living both on land and in water.
3 an amphibian vehicle.

N  animal, animal kingdom, fauna, brute creation, beast, brute, creature, critter, wight, created being, creeping thing, living thing, dumb animal, dumb creature, zoophyte, mammal, bird, reptile, amphibian, fish, crustacean, shellfish, mollusk, worm, insect, arthropod, microbe, microbe, animalcule, alligator, crocodile, saurian, dinosaur (extinct), snake, serpent, viper, eft, asp, aspick, frog, toad, trout, bass, tuna, muskelunge, sailfish, sardine, mackerel, ant, mosquito, bee, honeybee, tardigrade, spider, biped, quadruped, webfoot, flocks and herds, live stock, domestic animals, wild animals, game, ferae naturae, beasts of the field, fowls of the air, denizens of the sea, black game, black grouse, blackcock, duck, grouse, plover, rail, snipe, horse, cattle, kine, ox, bull, bullock, cow, milch cow, calf, heifer, shorthorn, sheep, lamb, lambkin, ewe, ram, tup, pig, swine, boar, hog, sow, steer, stot, tag, teg, bison, buffalo, yak, zebu, dog, cat, dog, hound, pup, puppy, whelp, cur, mongrel, house dog, watch dog, sheep dog, shepherd's dog, sporting dog, fancy dog, lap dog, toy dog, bull dog, badger dog, mastiff, blood hound, grey hound, stag hound, deer hound, fox hound, otter hound, harrier, beagle, spaniel, pointer, setter, retriever, Newfoundland, water dog, water spaniel, pug, poodle, turnspit, terrier, fox terrier, Skye terrier, Dandie Dinmont, collie, feline, puss, pussy, grimalkin, gib cat, tom cat, fox, Reynard, vixen, stag, deer, hart, buck, doe, roe, caribou, coyote, elk, moose, musk ox, sambar, bird, poultry, fowl, cock, hen, chicken, chanticleer, partlet, rooster, dunghill cock, barn door fowl, feathered tribes, feathered songster, singing bird, dicky bird, canary, warbler, finch, aberdevine, cushat, cygnet, ringdove, siskin, swan, wood pigeon, vermin, varmint, pest, animal, zoological equine, bovine, vaccine, canine, feline, fishy, piscatory, piscatorial, molluscous, vermicular, gallinaceous, rasorial, solidungulate, soliped.

amphibian family, amphibian genus