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monochorionic

(mŏn′ō-kôr′ē-ŏnĭk)
adj.
  1. Having a single or common chorion. Used of monozygotic twins.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.