from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The situation in which the individuals of a species are of one of two distinct sexes, and retain that sexuality throughout their lives

from the GNU version of the Collaborative International Dictionary of English

  • n. Separation of the sexes in different individuals; -- opposed to hermaphroditism.
  • n. In ontogony, differentiation of male and female individuals from embryos having the same rudimentary sexual organs.
  • n. In phylogeny, the evolution of distinct sexes in species previously hermaphrodite or sexless.

from The Century Dictionary and Cyclopedia

  • n. The bisexual or diœcious condition.


Sorry, no etymologies found.


  • It is clear from comparative anatomy that hermaphrodism -- the combination of both kinds of sexual cells in one individual -- is the earliest form of sexual differentiation; the separation of the sexes (gonochorism) was

    The Evolution of Man — Volume 2


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