The Collaborative International Dictionary of English v.0.48:

Vulva \Vul"va\, n. [L. vulva, volva, from volvere to roll.]
   [1913 Webster]
   1. (Anat.) The external parts of the female genital organs;
      sometimes, the opening between the projecting parts of the
      external organs.
      [1913 Webster]

   2. (Zool.) The orifice of the oviduct of an insect or other
      invertebrate.
      [1913 Webster]

WordNet (r) 3.0 (2006):

vulva
    n 1: external parts of the female genitalia

Moby Thesaurus II by Grady Ward, 1.0:

45 Moby Thesaurus words for "vulva":
   bag, ballocks, balls, basket, beard, breasts, cervix, clitoris,
   cod, cods, cullions, family jewels, female organs, genitalia,
   genitals, gonads, labia, labia majora, labia minora, lingam, lips,
   male organs, meat, nuts, nymphae, ovary, penis, phallus,
   private parts, privates, privy parts, pubic hair, pudenda,
   reproductive organs, rocks, scrotum, secondary sex characteristic,
   sex organs, spermary, testes, testicles, uterus, vagina, womb,
   yoni