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obstetric conjugate

n.
  1. The shortest pelvic diameter through which the fetal head must pass during birth, measured from the promontory of the sacrum to a point a few millimeters from the top 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.