Etymology
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amphibious (adj.)

1640s, "combining two qualities; having two modes of life," especially "living both on land and in water," from Latinized form of Greek amphibios "having a double life; living on land and in water" (see amphibian (adj.)). Of motor vehicles, from 1915.

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Definitions of amphibious

amphibious (adj.)
relating to or characteristic of animals of the class Amphibia;
Synonyms: amphibian
amphibious (adj.)
operating or living on land and in water;
frogs are amphibious animals
amphibious operations
amphibious vehicles
amphibious troops
From wordnet.princeton.edu