Pronunciation: (peg'u-sus),[key] —n., —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.