The Collaborative International Dictionary of English v.0.48:

Gorgoneion \Gor`go*ne"ion\ (g[^o]r`g[-o]*n[=e]"y[o^]n), n.; pl.
   Gorgoneia. [NL., fr. Gr. Gorgo`neios, equiv. to Gorgei^os
   belonging to a Gorgon.] (Arch.)
   A mask carved in imitation of a Gorgon's head. --Elmes.
   [1913 Webster]