Extraembryonic membrane formed by the fusion of the allantois with the serosa or false chorion. In mammals it forms the foetal portion of the placenta; in avian embryos it is fused with the shell. ... (05 Mar 2000) ...
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http://www.encyclo.co.uk/local/20973
(kor″e-o-ә-lan´to-is) an extraembryonic structure formed by union of the chorion and allantois, which by means of vessels in the associated mesoderm serves in gas exchange; in many mammals, it forms the placenta. adj., chorioallanto´ic., adj.
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http://www.encyclo.co.uk/local/21001
Type: Term Pronunciation: kō′rē-ō-ă-lan′tō-is Definitions: 1. Extraembryonic membrane formed by the fusion of the allantois with the serosa or false chorion. In mammalian embryos, it forms the fetal portion of the placenta; in avian embryos, it is fused with the shell.
Found on
http://www.medilexicon.com/medicaldictionary.php?t=17292
[
n] - very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
Found on
http://www.webdictionary.co.uk/definition.php?query=chorioallantois
chorioallantois 1. The highly vascular fetal membrane that consists of the fused chorion and allantois, found adjacent to the eggshell in reptiles and birds and constituting the placenta in most mammals. 2. A membrane surrounding an embryo. In a bird's or reptile's egg, it lies next to the shell. In mammals, it forms a major part of the placenta.
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http://www.wordinfo.info/words/index/info/view_unit/461/
chorioallantoic membrane noun very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
Found on
https://www.encyclo.co.uk/local/20974
a vascular, extraembryonic membrane of birds, reptiles, and certain mammals, formed by the fusion of the wall of the chorion with the wall of the allantois. Also called
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https://www.infoplease.com/dictionary/chorioallantois
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