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Definition of slag:

  1. A product of smelting, containing, mostly as silicates, the substances not sought to be produced as matte or metal, and having a lower specific gravity than the latter; -- called also, esp. in iron smelting, cinder. The slag of iron blast furnaces is essentially silicate of calcium, magnesium, and aluminium; that of lead and copper smelting furnaces contains iron.
  2. Same as Basic slag, above.
  3. The dross, or recrement, of a metal; also, vitrified cinders.
  4. The scoria of a volcano.
  5. To form, or form into, a slag; to agglomerate when heated below the fusion point.

Synonyms:

recrement, dross, scoria, refuse, impurity.

Usage examples: