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physiologic retraction ring in Medicine

physiologic retraction ring

n.
  1. A ridge on the inner uterine surface at the boundary between the upper and lower uterine segments that occurs in the course of normal labor.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.