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1. (n.) superfetation
the fertilization of an ovum in a female mammal already pregnant.
Etymology: (1595–1605; < L superfētā(re) to conceive again while still pregnant)
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| Definition of 'superfetation' |
Princeton's WordNet |
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1. (noun) superfetation
fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time
"superfetation is normal in some animal species"
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| Definition of 'superfetation' |
Webster Dictionary |
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1. (noun) superfetation
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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| Definition of 'superfetation' |
U.S. National Library of Medicine |
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1. superfetation
The FERTILIZATION of an OVUM that takes place when a FETUS is already present in the UTERUS. Superfetation results in an unusual PREGNANCY with fetuses of different ages and sizes developing in utero simultaneously.
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Definitions of superfetation 
