1. Relating to or used in religious rites or observances: The spiritual leader held a sacral object in her hand as she lead the opening prayer.
2. A reference to or near the large bone mass at the base of the spine: The doctor detected a fracture in the sacral region of the patient's lower back.

Mary's doctor explained that her sacral nerves were damaged when she slipped on the icy step by her door and fell down on her back.