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sciatic foramen

n.
  1. Either of two foramina, designated greater and lesser, formed by the sacrospinous and sacrotuberous ligaments crossing the sciatic notches of the hipbone.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.