lumb-
1 
variant of lumbo- before a vowel:
lumbar.
Related Words
- lumbar
- lumbo-
- numbles
lumb-
combining form 
or lumbo-
Etymology: Latin lumb-, from lumbus — more at loin 
1. : loin 
< lumbodynia >
2. : lumbar and 
< lumbosacral >
or lumbo-
1.
< lumbodynia >
2.
< lumbosacral >