Definition of lumbar adjective from the Oxford Advanced Learner's Dictionary

 

lumbar

 adjective
adjective
BrE BrE//ˈlʌmbə(r)//
 
; NAmE NAmE//ˈlʌmbər//
 
[only before noun](medical)
 
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relating to the lower part of the back pain in the lumbar region Word Origin mid 17th cent.: from medieval Latin lumbaris, from Latin lumbus ‘loin’.
See the Oxford Advanced American Dictionary entry: lumbar

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