Sacrum

**Semantic type:** Anatomical Structure

**Definition:** The triangular bone, made up of 5 fused bones of the spine, located in the lower area of the spine between the fifth lumbar vertebra and the coccyx.

**Synonyms:** - SACRUM - Sacral - Sacral Region - Sacral Region - Sacral Spine - fused sacrum - os sacrum [vertebrae sacrales I - V] - sacrum - sacrum - sacrum [sacral vertebrae I - V] - sacrum [sacral vertebrae I-V]