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Noun: superfetation  ,soo-pu(r)-fee'tey-shun
  1. Fertilization of a second ovum after a pregnancy has begun; results in two foetuses of different ages in the uterus at the same time
    "superfetation is normal in some animal species"

Derived forms: superfetations

Type of: fecundation, fertilisation [Brit], fertilization, impregnation

Encyclopedia: Superfetation