/ æmˈfɪbiən; NAmE / noun
any animal that can live both on land and in water. Amphibians have cold blood and skin without scales . Frogs , toads and newts are all amphibians.
—compare reptile
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WORD 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).