Source : Webster's Revised Unabridged Dictionary (1913)

Orpheus \Or"phe*us\, n. [L. Orpheus, Gr. ?.] (Gr. Myth.)
   The famous mythic Thracian poet, son of the Muse Calliope,
   and husband of Eurydice. He is reputed to have had power to
   entrance beasts and inanimate objects by the music of his
   lyre.

Source : WordNet®

Orpheus
     n : (Greek mythology) a great musician; when his wife Eurydice
         died he went to Hades to get her back but failed