"amphibians" 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
Source: WordNet® (An amazing lexical database of English)
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