chorioallantois
[kor″e-o-ah-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., adj chorioallanto´ic.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.
cho·ri·o·al·lan·to·is
(kō'rē-ō-ă-lan'tō-is), 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.
Farlex Partner Medical Dictionary © Farlex 2012
chorioallantois
(kôr′ē-ō′ə-lăn′tō-ĭs)n. 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.
cho′ri·o·al′lan·to′ic (-ō-ăl′ən-tō′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
cho·ri·o·al·lan·to·is
(kōr'ē-ō-ă-lan'tō-is) Extraembryonic membrane formed by the fusion of the allantois with the serosa or false chorion. In mammals it forms the fetal portion of the placenta; in avian embryos it is fused with the shell.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012