Source : Webster's Revised Unabridged Dictionary (1913)

Bisexual \Bi*sex"u*al\, a. [Pref. bi- + sexual.] (Biol.)
   Of both sexes; hermaphrodite; as a flower with stamens and
   pistil, or an animal having ovaries and testes.

Source : WordNet®

bisexual
     n : a person who is sexually attracted to both sexes [syn: {bisexual
         person}]

bisexual
     adj 1: sexually attracted to both sexes [ant: {heterosexual}, {homosexual}]
     2: having an ambiguous sexual identity [syn: {epicene}]