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pelvic plane of inlet

n.
  1. A plane that passes in front through the pubic symphysis and the pubic crest on either side, laterally by the iliopectineal lines, and in the rear by the promontory of the sacrum and is the upper 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.