amphibian

1. not comparableOf or relating to the class Amphibia.
2. not comparableCapable of operating on both land and water; amphibious.
3. not comparableobsoleteHaving two natures.

plural amphibians

1. An animal of the Amphibia; any vertebrate that does not have amniotic eggs, typically living both on land and in water.

   Synonyms: amphibium

2. A vehicle which can operate on both land and water.
3. uncommonA person with two distinct characters, qualities or identities.

   1 more example

   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.

   1994, R. J. W. Evans, “Austrian Identity in Hungarian Perspective: The Nineteenth Century”, in Ritchie Robertson, Edward Timms, editors, The Habsburg Legacy: National Identity in Historical Perspective (Austrian Studies; 5), Edinburgh: Edinburgh University Press, →ISBN, page 29