Dictionary.net

A winged horse fabled to have sprung from the body of Medusa when she was slain. He is noted for causing, with a blow of his hoof, Hippocrene, the inspiring fountain of the Muses, to spring from Mount Helicon. On this account he is, in modern times, associated with the Muses, and with ideas of poetic inspiration.

A northen constellation near the vernal equinoctial point. Its three brightest stars, with the brightest star of Andromeda, form the square of Pegasus.

A winged horse fabled to have sprung from the body of Medusa when she was slain. He is noted for causing, with a blow of his hoof, Hippocrene, the inspiring fountain of the Muses, to spring from Mount Helicon. On this account he is, in modern times, associated with the Muses, and with ideas of poetic inspiration.

A northen constellation near the vernal equinoctial point. Its three brightest stars, with the brightest star of Andromeda, form the square of Pegasus.

The winged horse, sprung from the blood of Medusa, that with a stroke opened a spring in the ground, whence the poets were fabled afterwards to draw their inspiration; the poetic muse; a northern constellation; a genus of fishes with large pectoral fins.

In anc. fable, the winged horse on which Bellerophon is said to have ridden when he slew the Chimaera; an anc. constellation; a genus of fishes with large pectoral fins.