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Related to the lower back or loin, specifically the five vertebrae between the rib cage and the pelvis. quotations examples
The lumbar spine supports the upper body and transmits the weight of the upper body to the pelvis and lower limbs.
2008, David J. Magee, Orthopedic Physical Assessment, 5th edition, page 515
plural lumbars
(informal) The lumbar region. examples
A lumbar vertebra. quotations examples
The first lumbar moved between the erect position and extreme flexion 8.2 cm.
1905, Robert W. Lovett, “The mechanism of the normal spine and its relation to scoliosis”, in Boston Medical and Surgical Journal, volume 153, number 13, pages 354–355