The Collaborative International Dictionary of English v.0.48:
anaphrodisia \an*aph`ro*dis"i*a\ ([a^]n*[a^]f`r[-o]*d[i^]z"[i^]*[.a]), n. [NL., fr. Gr. 'an priv. + 'afrodi`sia sexual pleasure, 'Afrodi`th the goddess of love.] (Med.) Absence of sexual appetite. AS [1913 Webster]WordNet (r) 3.0 (2006):
anaphrodisia n 1: decline or absence of sexual desire [ant: aphrodisia]