The Proto-Indo-European word *solhₓ-
Word *solhₓ-
Meaning dirty, dirt
See also Tocharian B: sal ‘dirty’
Synonyms *dʰer-/*dʰor-, *grúĝs, *leu-, *reh₁mós

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

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