Meanings
nounchorioallantois (plural chorioallantoises)
plural chorioallantoises
- anatomyThe vascular extraembryonic membrane, formed by the fusion of the allantois and the chorion, that makes up the placenta in most mammals; the chorioallantoic membrane
Synonyms & antonyms
nounthe very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
Similar
chorioallantoic membrane
Broader
membranetissue layer
Synonym sets from Open English WordNet, CC BY 4.0.
Cite this entry
APA
chorioallantois. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/chorioallantois
MLA
“chorioallantois.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/chorioallantois. Accessed November 4, 2026.
Chicago
WatkinsX Dictionary, s.v. “chorioallantois,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/chorioallantois.
Source: chorioallantois on Wiktionary, CC BY-SA 4.0.