- The definition of an amphibian is a cold-blooded animal which can live on land or in water and who breathes with gills when young and with lungs as an adult.
A frog is an example of an amphibian.
An example of an amphibian is this toad.
amphibian definition by Webster's New World
- any of a class (Amphibia) of coldblooded, scaleless vertebrates, consisting of frogs, toads, newts, salamanders, and caecilians, that usually begin life in the water as tadpoles with gills and later develop lungs
- any amphibious animal or plant
- any aircraft that can take off from and come down on either land or water
- a tank or other vehicle that can travel on either land or water
Origin: ; from Modern Latin Amphibia ; from Classical Greek amphibia, neuter plural of amphibios: see amphibious
- of amphibians
amphibian definition by American Heritage Dictionary
- A cold-blooded, smooth-skinned vertebrate of the class Amphibia, such as a frog or salamander, that characteristically hatches as an aquatic larva with gills. The larva then transforms into an adult having air-breathing lungs.
- An animal capable of living both on land and in water.
- An aircraft that can take off and land on either land or water.
- A tracked or wheeled vehicle that can operate both on land and in water.
Origin: From New Latin Amphibia, class name, from Greek, neuter pl. of amphibios, amphibious : amphi-, amphi- + bios, life; see gwei- in Indo-European roots.
amphibian - Science Definition