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English to English noun
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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
source: wordnet30
| 2 |
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. | | source: webster1913
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