superfetation

Noun
  1. Fertilization of a second ovum after a pregnancy has begun;
    Results in two fetuses of different ages in the uterus at the same time (synset 107452996)
    "superfetation is normal in some animal species"
    is a type of: fecundation, fertilisation, fertilization, impregnation - creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant

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