1. 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. 2. An animal capable of living both on land and in water. 3. An aircraft that can take off and land on either land or water. 4. A tracked or wheeled vehicle that can operate both on land and in water.
ETYMOLOGY:
From New Latin Amphibia, class name, from Greek, neuter pl. of amphibios, amphibious : amphi-, amphi- + bios, life; see gwei- in Appendix I.
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