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rule of outlet in Medicine

rule of outlet

n.
  1. A rule for determining whether the pelvic outlet will allow the passage of a normal-sized fetus by calculating whether the sum of the posterior sagittal diameter and the transverse diameter of the outlet equal at least 15 centimeters.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.