Superfetation /(?)/
Su·per·fe·ta·tion
Superfetation
n.
-
The formation of a fetus at the result of an impregnation occurring after another impregnation but before the birth of the offspring produced by it. This is possible only when there is a double uterus, or where menstruation persists up to the time of the second impregnation. (Physiol.)
In then became a superfetation upon, and not an ingredient in, the national character.