Pronunciation: (peg'u-sus), [key]
—gen. -siPronunciation: (-sī") [key] for 2.
1. Class. Myth.a winged horse, created from the blood of Medusa, that opened the spring of Hippocrene with a stroke of its hoof, and that carried Bellerophon in his attack on the Chimera.
2. Astron.the Winged Horse, a northern constellation between Cygnus and Aquarius.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.