WordReference Random House Unabridged Dictionary of American English © 2020
lumbo-, 
  • 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

    'lumbo-' also found in these entries (note: many are not synonyms or translations):
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