allantochorion

[ə-lăn′tō-kôrē-ŏn′]

n.

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.