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Superfetation is a 13 letter word which starts with the letter S and ends with the letter N for which we found 1 definitions.

(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.
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