The Collaborative International Dictionary of English v.0.48:
Erinys \E*rin"ys\, n.; pl. Erinyes. [L., fr. Gr. ?.] (Class. Myth.) An avenging deity; one of the Furies; sometimes, conscience personified. [Written also Erinnys.] [1913 Webster]WordNet (r) 3.0 (2006):
Erinyes n 1: (classical mythology) the hideous snake-haired monsters (usually three in number) who pursued unpunished criminals [syn: Fury, Eumenides, Erinyes]