Wordnet 3.0
NOUN (1)
1.
the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois;
[syn: chorioallantois, chorioallantoic membrane]
The Collaborative International Dictionary of English v.0.48:
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]
WordNet (r) 3.0 (2006):
chorioallantois
n 1: the very vascular fetal membrane composed of the fused
chorion and adjacent wall of the allantois [syn:
chorioallantois, chorioallantoic membrane]