noun, genitive Peg·a·si [peguh-sahy] /ˈpɛg əˌsaɪ/ for 2.

  1. Classical Mythology. 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. Astronomy. the Winged Horse, a northern constellation between Cygnus and Aquarius.


  1. Greek myth an immortal winged horse, which sprang from the blood of the slain Medusa and enabled Bellerophon to achieve many great deeds as his rider

noun Latin genitive Pegasi (ˈpɛɡəˌsaɪ)

  1. a constellation in the N hemisphere lying close to Andromeda and Pisces

winged horse in Greek mythology, late 14c., from Latin, from Greek Pegasos, usually said to be from pege “fountain, spring; a well fed by a spring” (plural pegai), especially in “springs of Ocean,” near which Medusa was said to have been killed by Perseus (Pegasus sprang from her blood). But this may be folk etymology, and the suffix -asos suggests a pre-Greek origin [Klein].

  1. A constellation in the Northern Hemisphere near Aquarius and Andromeda.

In classical mythology, a winged horse, tamed by the hero Bellerophon with the help of a bridle given to him by Athena.

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