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chorioallantois

American

[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.

Other Word Forms

Derived Forms

chorioallantoic

adjective

Etymology

Origin of chorioallantois

First recorded in 1930–35

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.