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say it: LUHM-bahr
lumbar is an adjective meaning "of or relating to or near the part of the back between the ribs and the hipbones". It carries one recorded sense.
of or relating to or near the part of the back between the ribs and the hipbones
“lumbar vertebrae”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for lumbar come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.