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.