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[kawr-ee-oh-uh-lan-toh-is, ‐tois, kohr‐] /ˌkɔr i oʊ əˈlæn toʊ ɪs, ‐tɔɪs, ˌkoʊr‐/
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.
Origin of chorioallantois
First recorded in 1930-35
Related forms
[‐al-uh n-toh-ik] /‐ˌæl ənˈtoʊ ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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chorioallantois in Medicine

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
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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