Superfetation
WordNet
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
"Superfetation is normal in some animal species"
WiktionaryText
Etymology
From Latin superfetare ‘conceive while pregnant’, from super- + foetus.
Noun
- an excessive accumulation; a superfluous addition
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- 1857: These gentlemen were greatly astonished at Bovary's romantic ideas, and the pharmacist hurried in to say to him: "This velvet looks to me rather a superfetation. Besides, the expense..." — Gustave Flaubert, Madame Bovary (tr. Geoffrey Wall 1992).
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- the formation of a fetus while another fetus is already present in the uterus.