Webster's English Dictionary

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pegasus

Peg.a.sus \'peg-*-s*s\ n [L (gen. Pegasi), fr. Gk Pe-gasos] 1: a winged 
   horse that in Greek mythology caused Hippocrene to burst forth  from Mount 
   Helicon with a blow of his hoof 2: poetic inspiration  3: a northern 
   constellation near the vernal equinoctial point