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Answer for the clue "Very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois ", 15 letters:
chorioallantois

Word definitions for chorioallantois in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
chorioallantois \chorioallantois\ n. a very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois. Syn: chorioallantoic membrane. [WordNet 1.5] ||

Wiktionary Word definitions in Wiktionary
n. (context anatomy English) The vascular extraembryonic membrane, formed by the fusion of the allantois and the chorion, that makes up the placenta in most mammals; the chorioallantoic membrane

WordNet Word definitions in WordNet
n. very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois [syn: chorioallantoic membrane ]