amphibian

adj

1. (not-comparable)Of or relating to the class Amphibia.
2. (not-comparable)Capable of operating on both land and water; amphibious.
3. (not-comparable, obsolete)Having two natures.

noun

1. An animal of the Amphibia; any vertebrate that does not have amniotic eggs, living both on land and in water.
2. A vehicle which can operate on both land and water.
3. (uncommon)A person with two distinct characters, qualities or identities.

   “The prime exemplar of such a cast of mind must be Johann Ladislas Pyrker, a definite amphibian and ‘Austro-Hungarian’ in his literary and in his public life. The son of another estate bailiff in Transdanubia, Pyrker became successively a Hungarian official, an Austrian monk and at length a fairly worldly abbot at Lilienfeld, then a bishop in Hungary, patriarch of Venice, and archbishop in Hungary again.”