n. [ Cf. F. superfétation. ] (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 ]
(n) fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time, Example: superfetation is normal in some animal species
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