"amphibian" in the noun sense
1. amphibian, amphibious vehicle
a flat-bottomed motor vehicle that can travel on land or water
2. amphibian, amphibious aircraft
an airplane designed to take off and land on water
3. amphibian
cold-blooded vertebrate typically living on land but breeding in water aquatic larvae undergo metamorphosis into adult form
"amphibian" in the adjective sense
1. amphibious, amphibian
relating to or characteristic of animals of the class Amphibia
Source: WordNet® (An amazing lexical database of English)
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