The Proto-Indo-European word *reh₁mós
Word *reh₁mós
Meaning dirt, dirty, soot
Synonyms *dʰer-/*dʰor-, *grúĝs, *leu-, *solhₓ-

Comments
Mallory J.P. and Adams D. (2006)

Other words that might be of interest
*mai- ‘soil, defile’