Definition of gorgoneion:
(n) :
A (representation of a) gorgon's head, especially that of Medusa.
(n) :
(historical, Ancient Greek theatre) A theatrical mask depicting the face of a gorgon.
(n) :
(Greek mythology) The head of the gorgon Medusa.
(n) :
(Greek mythology) A pendant, worn by the goddess Athena, which features an image of Medusa's head.
(n) :
(astronomy) The smaller and closer-orbiting of the two moons of the main-belt asteroid 93 Minerva.