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sa·cro·il·i·ac .sak-rō-'il-ē-.ak, .sā-krō- adj of, relating to, affecting, or being the region of the joint between the sacrum and the ilium <\sacroiliac distress>
sacroiliac n SACROILIAC JOINT
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sa·cro·il·i·ac (sa″kro-ilґe-ak) pertaining to the sacrum and ilium; denoting the joint or articulation between the sacrum and ilium and the ligaments associated therewith.Medical dictionary. 2011.