noun
a medical condition in which a fetus is found inside the body of its twin
preposition
in
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Foetus in foetu is a rare condition where a malformed foetus is found inside the body of its twin.
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Did you know there was a case of foetus in foetu where a baby was born with its twin inside it?
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Hey, have you heard about that crazy thing called foetus in foetu?
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The idea of carrying around emotional baggage can be compared to having a foetus in foetu, hidden deep within oneself.