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Medical Definition of Chorioallantoic placenta
1. A placenta (such as that of primates) in which the chorion is formed by the fusion of the allantoic mesoderm and vessels to the inner face of the serosa. (05 Mar 2000)
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1. A placenta (such as that of primates) in which the chorion is formed by the fusion of the allantoic mesoderm and vessels to the inner face of the serosa. (05 Mar 2000)