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Entry 4 senses · 2 variants Webster, 1913

Slag

/(slăg)/ · IPA /slæɡ/
01 n. The dross, or recrement, of a metal; also, vitrified cinders.
  1. 1.
    The dross, or recrement, of a metal; also, vitrified cinders.
  2. 2.
    The scoria of a volcano.
  3. 3.
    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.(Metal.) Also: cinder
Phrases & compounds
Slag furnace — a furnace, or hearth, for extracting lead from slags or poor ore.
Slag wool — mineral wool. See under Mineral.
02 v. i. & t. To form, or form into, a slag; to agglomerate when heated below the fusion point.
imp. & p. p. Slagged; p. pr. & vb. n. Slagging
  1. 1.
    To form, or form into, a slag; to agglomerate when heated below the fusion point.(Metal.)