chorioallantois

noun

cho·​rio·​al·​lan·​to·​is ˌkȯr-ē-(ˌ)ō-ə-ˈlan-tə-wəs 

: a vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois that in the hen's egg is used as a living culture medium for viruses and for tissues

called also chorioallantoic membrane

chorioallantoic

ˌkȯr-ē-(ˌ)ō-ˌa-lən-ˈtō-ik 

adjective

Word History

Etymology

New Latin, from Greek chorion + New Latin allantois

First Known Use

1933, in the meaning defined above

Medical Definition

chorioallantois

noun

cho·​rio·​al·​lan·​to·​is ˌkōr-ē-ō-ə-ˈlant-ə-wəs, ˌkȯr- 

plural chorioallantoides -ō-ˌal-ən-ˈtō-ə-ˌdēz, -ō-ˌal-ˌan- 

: a vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois that in the hen's egg is used as a living culture medium for viruses and for tissues

called also chorioallantoic membrane

chorioallantoic

-ˌal-ən-ˈtō-ik 

adjective