Origin and Etymology of chorioallantois
New Latin, from Greek chorion + New Latin allantois
First Known Use: 1933See Words from the same year
Medical Definition of chorioallantois
: 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
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