| NOUN | event | superfetation | fertilization of a second ovum after a pregnancy has begun |
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| Meaning | fertilization of a second ovum after a pregnancy has begun; results in two fetuses of different ages in the uterus at the same time. | |
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| Example | "superfetation is normal in some animal species" | |
| Broader | fertilization, fertilisation, fecundation, impregnation | creation by the physical union of male and female gametes |
| Spanish | superfetación | |
| Verbs | superfetate | conceive when a fetus is already present in the uterus |
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