any cold-blooded vertebrate of the class Amphibia, typically living on land but breeding in water. Their aquatic larvae (tadpoles) undergo metamorphosis into the adult form. The class includes the newts and salamanders, frogs and toads, and caecilians

a type of aircraft able to land and take off from both water and land

any vehicle able to travel on both water and land

of, relating to, or belonging to the class Amphibia