amphibian /amˈfɪbɪən/

a

I. noun

1. a cold-blooded vertebrate animal of a class that comprises the frogs, toads, newts, salamanders, and caecilians. They are distinguished by having an aquatic gill-breathing larval stage followed (typically) by a terrestrial lung-breathing adult stage.

●Class Amphibia: orders Urodela (newts and salamanders), Anura (frogs and toads), and Gymnophiona (caecilians).
2. a seaplane, tank, or other vehicle that can operate on land and on water.
II. adjective

relating to amphibians.

amphibian eggs.
– origin mid 17th cent. (in the sense ‘having two modes of existence or of doubtful nature’): from modern Latin amphibium ‘an amphibian’, from Greek amphibion (noun use of amphibios ‘living both in water and on land’, from amphi ‘both’ + bios ‘life’).

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