[ kawr-ee-oh-uh-lan-toh-is, ‐tois, kohr‐ ]

nounEmbryology, 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.

Origin of chorioallantois

First recorded in 1930–35
  • Also called chorioallantoic membrane.

Other words from chorioallantois

  • cho·ri·o·al·lan·to·ic [‐al-uhn-toh-ik], /‐ˌæl ənˈtoʊ ɪk/, adjective

Words Nearby chorioallantois Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2024