Source : Webster's Revised Unabridged Dictionary (1913)

Uterus \U"te*rus\, n. [L.]
   1. (Anat.) The organ of a female mammal in which the young
      are developed previous to birth; the womb.

   Note: The uterus is simply an enlargement of the oviduct, and
         in the lower mammals there is one on each side, but in
         the higher forms the two become more or less completely
         united into one. In many male mammals there is a small
         vesicle, opening into the urinogenital canal, which
         corresponds to the uterus of the female and is called
         the male uterus, or [NL.] uterus masculinus.

   2. (Zo["o]l.) A receptacle, or pouch, connected with the
      oviducts of many invertebrates in which the eggs are
      retained until they hatch or until the embryos develop
      more or less. See Illust. of {Hermaphrodite} in Append.

Source : WordNet®

uterus
     n : a hollow muscular organ in the pelvic cavity of females;
         contains the developing fetus [syn: {womb}]
     [also: {uteri} (pl)]