amphibian

(noun) a flat-bottomed motor vehicle that can travel on land or water. Synonyms: amphibious vehicle.

(noun) an airplane designed to take off and land on water. Synonyms: amphibious aircraft.

(noun) cold-blooded vertebrate typically living on land but breeding in water; aquatic larvae undergo metamorphosis into adult form.

(adj) relating to or characteristic of animals of the class Amphibia. Synonyms: amphibious.