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allantochorion in Medicine

allantochorion

(ə-lăn′tō-kôrē-ŏn′)
n.
  1. The extraembryonic membrane formed by the fusion of the allantois and the chorion.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.