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About Our Definitions: All forms of a word (noun, verb, etc.)
are now displayed on one page. Definition of AMPHIBIAN : an
amphibious organism; especially: any of a class (Amphibia) of
cold-blooded vertebrates (as frogs, toads, or salamanders)
intermediate in many characters between fishes and reptiles and
having gilled aquatic larvae and air-breathing adults : an
amphibious vehicle; especially: an airplane designed to take off
from and land on either land or water ultimately from Greek
amphibion amphibious being, from neuter of amphibios First Known
Use: 1835 Any member of a class (Amphibia) of cold-blooded
vertebrate animals that includes more than 6,200 species in
three groups: frogs and toads (order Anura), salamanders (order
Caudata), and caecilians (order Gymnophiona). Probably evolved
from certain fish species of the Early Devonian Period (416–397
million years ago), amphibians were the first vertebrates to
move from an aquatic environment