From Wiktionary, the free dictionary
From sacro- + spinous.
sacrospinous (not comparable)
- (anatomy) Pertaining to the sacrum and spine.
2007 June 24, Mary Roach, “Love and Human Remains”, in New York Times[1]:The Dissector spits out Latin terms for ligaments — sacrospinous, sacrotuberous; Montross hears them “like a call to prayer.”