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pelvic plane of outlet

n.
  1. An imaginary plane that passes in front through the pubic arch, laterally by the rami of the ischium and the sacrotuberous ligament on either side, and in the rear by these ligaments and the tip of the coccyx and is the lower opening of the small pelvis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.