[luhm-ber, -bahr]
of or pertaining to the loin or loins.
a lumbar vertebra, artery, or the like.

1650–60; < Neo-Latin lumbāris. See lumb-, -ar1

prelumbar, adjective
sublumbar, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lumbar (ˈlʌmbə)
of, near, or relating to the part of the body between the lowest ribs and the hipbones
[C17: from New Latin lumbāris, from Latin lumbus loin]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"pertaining to or situated near the loins," 1656, from Mod.L. lumbaris, from L. lumbus "loin."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

lumbar lum·bar (lŭm'bər, -bär')
Of, near, or situated in the part of the back and sides between the lowest ribs and the pelvis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
lumbar   (lŭm'bər)  Pronunciation Key 
Located at or near the part of the back lying between the lowest ribs and the hips.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Totally has your back-also makes a great lumbar support.
Top pocket detaches and transforms into a fanny pack with built-in lumbar supp
Then he revealed that he did have too much backbone, literally--six lumbar
  vertebrae instead of five.
For day hikes, a small day pack or lumbar pack should suffice.
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