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The Collaborative International Dictionary of English v.0.48 (gcide)

Superfetation \Su`per*fe*ta"tion\, n. [Cf. F. superf['e]tation.]
(Physiol.)
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.
[1913 Webster]

In then became a superfetation upon, and not an
ingredient in, the national character. --Coleridge.
[1913 Webster]

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