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Meaning of sacroiliac

sac•ro•il•i•ac

Pronunciation: (sak"rō-il'ē-ak", sā"krō-), [key]
— Anat. Anat.
—n.
  1. the joint where the sacrum and ilium meet.
—adj.
  1. of, pertaining to, or affecting this joint.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.