noun
- a triangular bone at the base of the spine formed by the fusion of five vertebrae
Usage: anatomy
Examples
- The sacrum connects the spine to the pelvis.
- A fall onto the tailbone can sometimes affect the sacrum.
- The doctor explained that the sacrum consists of fused vertebrae.
- Pain in the lower back may involve the sacrum.
- The sacrum forms part of the pelvic girdle.
- X-rays showed a fracture in the patient’s sacrum.