The Collaborative International Dictionary of English v.0.48:

Genitals \Gen"i*tals\, n. pl. [From Genital, a.: cf. L.
   genitalia.]
   The organs of generation; the sexual organs; the private
   parts.
   [1913 Webster]

WordNet (r) 3.0 (2006):

genitals
    n 1: external sex organ [syn: genitalia, genital organ,
         genitals, private parts, privates, crotch]