WordReference Random House Unabridged Dictionary of American English © 2026
lumb-, 
  1. var. of lumbo- before a vowel:lumbar.

WordReference Random House Unabridged Dictionary of American English © 2026
lumbo-, 
  1. a combining form meaning "loin,'' used in the formation of compound words:lumbosacral.
Also,[esp. before a vowel,] lumb-. 
  • see -o- combining form representing Latin lumbus loin

'lumb-' also found in these entries (note: many are not synonyms or translations):
loin - lumbago - lumbar - lumbo- - numbles

Forum discussions with the word(s) "lumb-" in the title:


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