[ kawr-ee-oh-uh-lan-toh-is, ‐tois, kohr‐ ]
/ ˌkɔr i oʊ əˈlæn toʊ ɪs, ‐tɔɪs, ˌkoʊr‐ /
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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.
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Also called chorioallantoic membrane.
Origin of chorioallantois
First recorded in 1930–35
OTHER WORDS FROM chorioallantoischo·ri·o·al·lan·to·ic [‐al-uhn-toh-ik], /‐ˌæl ənˈtoʊ ɪk/, adjective
Words nearby chorioallantois
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Medical definitions for chorioallantois
[ kôr′ē-ō′ə-lăn′tō-ĭs ]
The highly vascular extraembryonic membrane formed by the fusion of the allantois with the chorion that constitutes the placenta in most mammals.
Other words from chorioallantoischo′ri•o•al′lan•to′ic (-ō-ăl′ən-tō′ĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.