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allantochorion

[ ə-lăn′tō-kôrē-ŏn′ ]
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n.

The extraembryonic membrane formed by the fusion of the allantois and the chorion.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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