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noun Superfetation n. (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. "In then became a superfetation upon, and not an ingredient in, the national character."
Collaborative International Dictionary of English 0.48
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