a combining form meaning “loin,” used in the formation of compound words: lumbosacral.

Also especially before a vowel, lumb-.

Origin of lumbo-

combining form representing Latin lumbus loin; see -o- Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for lumbo-

word-forming element meaning "loin, loins," from comb. form of Latin lumbus (see lumbago).

Online Etymology Dictionary, © 2010 Douglas Harper