chorioallantoic membrane


[kawr-ee-oh-uh-lan-toh-is, ‐tois, kohr‐]
noun Embryology, Zoology.
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.
Also called chorioallantoic membrane.


chorioallantoic [‐al-uhn-toh-ik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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American Heritage
Medical Dictionary

chorioallantois cho·ri·o·al·lan·to·is (kôr'ē-ō'ə-lān'tō-ĭs)
The highly vascular extraembryonic membrane formed by the fusion of the allantois with the chorion that constitutes the placenta in most mammals.

cho'ri·o·al'lan·to'ic (-ō-āl'ən-tō'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
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