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chorioallantois

[kawr-ee-oh-uh-lan-toh-is, ‑tois, kohr‑]

noun

Embryology, Zoology.

  1. a vascular, extraembryonic membrane of birds, reptiles, and certain mammals, formed by the fusion of the wall of the chorion with the wall of the allantois.

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Other Word Forms

  • chorioallantoic adjective
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Word History and Origins

Origin of chorioallantois1

First recorded in 1930–35

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chorio-choriocarcinoma

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