Definitions for: Superfetate

[v] conceive when a fetus is already present in the uterus

Webster (1913) Definition: Su`per*fe"tate, v. i. [L. superfetare; super
above, over + fetare to bring forth.]
To conceive after a prior conception, but before the birth of
the offspring.

The female . . . is said to superfetate. --Grew.

See Also: conceive