chorioallantois

American  

[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.

---

Other Word Forms

• chorioallantoic adjective

Etymology

Origin of chorioallantois

First recorded in 1930–35