/ Dictionary / Index P Pegasus: Meaning and Definition of Find definitions for: Peg•a•sus Pronunciation: (peg'u-sus), [key] — gen. -si 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. the Winged Horse, a northern constellation between Cygnus and Aquarius. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pegasus (Thesaurus) peg Peg-Board Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language