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constriction ring

n.
  1. True spastic stricture of the uterine cavity caused by a zone of muscle undergoing tetanic contraction and forming a tight constriction about some part of the fetus.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.