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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 Words From

  • chori·o·allan·toic [‑-al-, uh, n-, toh, -ik], adjective

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Word History and Origins

Origin of chorioallantois1

First recorded in 1930–35

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