Lumbar (adjective)

1. Relating to the lower part of the back, usually between the ribs and the hips.
2. Of or relating to the five vertebrae in the lower part of the spinal column.

Origin:

Mid 19th century: from latin lumbus "loin".

Examples:

1. He had a lumbar injury and was in a lot of pain.
2. The lumbar region is the lower part of the spine.
3. The lumbar vertebrae are the five lower vertebrae in the spinal column.
4. He had a lumbar puncture to diagnose a spinal injury.
5. The lumbar region of the spine is the most common area for back pain.