Definition of "lumbar" []

• Of, near, or situated in the part of the back and sides between the lowest ribs and the pelvis. (adjective)
• A lumbar artery, nerve, vertebra, or part. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Many physicians and patients use the term lumbar disc disease to encompass several different causes of back pain or sciatica."
• "When degenerated discs in the spine cause chronic back pain, surgeons sometimes do a procedure called lumbar fusion, in which two or more vertebrae of the spine are fused to each other."
• "The only type of spine surgery for which Infuse has been approved is a frontal approach to the lower backbone, known as the lumbar spine."