Source : Webster's Revised Unabridged Dictionary (1913)

Anaphrodisia \An*aph`ro*dis"i*a\, n. [NL., fr. Gr. 'an priv. + ?
   sexual pleasure, ? the goddess of love.] (Med.)
   Absence of sexual appetite.

Source : WordNet®

anaphrodisia
     n : decline or absence of sexual desire [ant: {aphrodisia}]