Source : Webster's Revised Unabridged Dictionary (1913)

Anaphrodisiac \An*aph`ro*dis"i*ac\, a. & n. [Gr. 'an priv. + ?
   pertaining to venery.] (Med.)
   Same as {Antaphrodisiac}. --Dunglison.

Source : WordNet®

anaphrodisiac
     adj : tending to diminish sexual desire [ant: {aphrodisiac}]