1. Relating to the lumbar and the hypochondriac regions. 2. Relating to the lumbar vertebrae and the ribs; denoting a ligament connecting the first lumbar vertebra with the neck of the twelfth rib. [L. lumbus, loin, + costa, rib]
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lum·bo·cos·tal (lum″bo-kosґtəl) pertaining to the lumbar vertebrae and ribs.Medical dictionary. 2011.