Definition of 'amphibian'

Noun

1. a flat-bottomed motor vehicle that can travel on land or water
      Synonyms: amphibious vehicle
2. an airplane designed to take off and land on water
      Synonyms: amphibious aircraft
3. cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form

Adjective

1. relating to or characteristic of animals of the class Amphibia
      Synonyms: amphibious

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