chorioallantois

[ 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.

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Also called chorioallantoic membrane.

Origin of chorioallantois

First recorded in 1930–35

OTHER WORDS FROM chorioallantois

cho·ri·o·al·lan·to·ic [‐al-uhn-toh-ik], /‐ˌæl ənˈtoʊ ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Medical definitions for chorioallantois

chorioallantois
[ kôr′ē-ō′ə-lăntō-ĭs ]

n.

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 chorioallantois

cho′ri•o•al′lan•toic (-ō-ăl′ən-tōĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.