/ Dictionary / Index L lumbar: Meaning and Definition of Find definitions for: lum•bar Pronunciation: (lum'bur, -bär), [key] — adj. of or pertaining to the loin or loins. —n. a lumbar vertebra, artery, or the like. See illus. under Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: lumbar (Thesaurus) lumbago lumbar plexus Related Content Daily Word Quiz: dormant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language