/ Dictionary / Index S sacroiliac: Meaning and Definition of Find definitions for: sac•ro•il•i•ac Pronunciation: (sak"rō-il'ē-ak", sā"krō-), [key] — Anat. Anat. —n. the joint where the sacrum and ilium meet. —adj. of, pertaining to, or affecting this joint. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. sacro- sacrosanct Related Content Daily Word Quiz: feral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language