WordReference Random House Unabridged Dictionary of American English © 2025
so•lum  (sō′ləm),USA pronunciation n., pl. -la (-lə),USA pronunciation -lums. 
  1. Ecology, Geologythe upper part of the soil profile, which is influenced by plant roots;
    the A horizon and the B horizon.
  • Latin: base, bottom; see sole2
  • 1820–30

'solum' also found in these entries (note: many are not synonyms or translations):
entresol - sill - soil - sol - sole - solifluction

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


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