dross

Noun
  1. Worthless or dangerous material that should be removed (synset 114607850)
    "there were impurities in the water"
    is a type of: waste, waste material, waste matter, waste product - any materials unused and rejected as worthless or unwanted
    same as: impurity
  2. The scum formed by oxidation at the surface of molten metals (synset 115067423)
    is a type of: scum - a film of impurities or vegetation that can form on the surface of a liquid
    subtypes: basic slag - slag produced in making steel; low in silica but having large amounts of calcium phosphate; useful as fertilizer
    same as: scoria, slag

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