amphibian
noun
am·phib·i·an
| \ am-ˈfi-bē-ən
\
\
Definition of amphibian
1
: an amphibious organism
especially
: any of a class (Amphibia) of cold-blooded vertebrates (such as frogs, toads, or salamanders) intermediate in many characters between fish and reptiles and having gilled aquatic larvae and air-breathing adults
Unlike reptiles, most amphibians possess a smooth, moist skin and lay their shell-less eggs in water or wet places. — Jeffrey P. Cohn
2
: an amphibious vehicle
especially
: an airplane designed to take off from and land on either land or water