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Slag (a liquid) is a by-product of smelting ore. Slag, as a liquid, is distinguished from dross, which is a solid.

Slag (welding) or welding slag (a solid) is a form of slag produced as a by-product of some arc welding processes.

Slag may also refer to:

Arts, entertainment, and mediaEdit

Other usesEdit

  • Slag, a pejorative British term for slut
  • Slag, an alternative name for spoil tip, mining waste
  • Slag Hill, a subglacial volcano in southwestern British Columbia, Canada