dross
1. [ noun ] worthless material that should be removed
Synonyms: impurity
Examples:

"there were impurities in the water"

Related terms: waste
2. [ noun ] the scum formed by oxidation at the surface of molten metals
Synonyms: scoria slag
Related terms: scum basic_slag
Similar spelling:   dress
  drosky
  dressy
  Dryas
  druse
  Dries
  Drews
  dregs
  Drees
  Drago
  Draco
  drowsy
  drowse
  Dreese
  Driggs
  Drewes
  Dragoo