slag

Noun
  1. 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: dross, scoria
Verb
  1. Convert into slag (synset 200586984)
    is a type of: convert - change the nature, purpose, or function of something

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