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chorioallantois

[kawr-ee-oh-uh-lan-toh-is, ‐tois, kohr‐] /ˌkɔr i oʊ əˈlæn toʊ ɪs, ‐tɔɪs, ˌkoʊr‐/
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.
Also called chorioallantoic membrane.
Origin
1930-1935
1930-35
Related forms
chorioallantoic
[‐al-uh n-toh-ik] /‐ˌæl ənˈtoʊ ɪk/ (Show IPA),
adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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chorioallantois in Medicine

chorioallantois cho·ri·o·al·lan·to·is (kôr'ē-ō'ə-lān'tō-ĭs)
n.
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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