sacrum
/ˈsækrəm/
noun
- A triangular bone at the base of the spine, located between the two hip bones, that forms part of the pelvis.
- The sacrum connects the spine to the pelvis and helps support the body's weight.
- A fracture of the sacrum can cause severe pain and difficulty walking.
- During childbirth, the sacrum moves slightly to allow the baby to pass through the pelvis.