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TAKE THE QUIZchorioallantois
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
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Merriam-Webster unabridged
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