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pelvic plane of least dimensions

n.
  1. The plane that extends from the end of the sacrum to the lower border of the pubic symphysis, bounded posteriorly by the end of the sacrum, laterally by the ischial spines, and anteriorly by the lower border of the pubic symphysis.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.