Amphibian

Amphibian, literally the animals 'living both in water and on land' in Greek or having both life, is a term in zoology that refers to a cold-blooded vertebrate animal of a class distinguished by having an aquatic gill-breathing larval stage followed typically by a terrestrial lung-breathing adult stage. They include the frogs, toads, newts, and salamanders.

Amphibians belong to the class Amphibia. Their orders are Urodela (newts and salamanders), Anura (frogs and toads), and Gymnophiona (caecilians).

Anything of or relating to this class of animals is also called amphibian. Sometimes the vehicles capable of being operated on both land and water are also called by this name, such as an amphibian tank.