Definitions:

1. One of the five fused bones that make up the sacrum, between the lumbar spine and the coccyx or tailbone. NOUN
   • Injury to the sacral vertebrae can affect nerve function in the legs and pelvic organs.
2. One of the five vertebral bones that fuse during development to form the sacrum, which connects the spine to the pelvis and supports the upper body's weight when standing and walking. NOUN
   • The sacral vertebrae fuse together during late adolescence.

Synonyms:

• vertebra sacralis