amphibium

from The Collaborative International Dictionary of English v.0.48

Amphibium \Am*phib"i*um\, n.; pl. L. {Amphibia}; E.
   {Amphibiums}. [NL., fr. Gr. ? (sc. ? an animal). See
   {Amphibious}.]
   An amphibian.
   [1913 Webster]