Source : Webster's Revised Unabridged Dictionary (1913)

Krishna \Krish"na\, n. [Skr. k[.r]sh[.n]a.] (Hindoo Myth.)
   The most popular of the Hindoo divinities, usually held to be
   the eighth incarnation of the god Vishnu.

Source : WordNet®

Krishna
     n : 8th and most important avatar of Vishnu; incarnated as a
         handsome young man playing a flute