noun pl \am-ˈfib-ē-ə\

Definition of AMPHIBIA

: a class of subphylum Vertebrata comprising forms (as the frogs, toads, newts, and salamanders) that are intermediate in many respects between fishes and reptiles, are cold-blooded with nucleated red blood cells and a 3-chambered heart, and that have gilled aquatic larvae and air-breathing adults
: the members of the class Amphibia
am·phib·i·an \-ē-ən\ noun or adjective

Seen & Heard

What made you want to look up Amphibia? Please tell us where you read or heard it (including the quote, if possible).