Lumbar \Lum"bar\, Lumbal \Lum"bal\, a. [L. lumbus loin. See Loin.]

(Anat.) Of, pertaining to, or near, the loins; as, the lumbar arteries.

Lumbar region (Anat.), the region of the loin; specifically, a region between the hypochondriac and ilias regions, and outside of the umbilical region.

Source: Webster's Revised Unabridged Dictionary (1913)