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4 definitions found
 for Slag
From The Collaborative International Dictionary of English v.0.48 :

  Slag \Slag\ (sl[a^]g), n. [Sw. slagg, or LG. slacke, whence G.
     schlacke; originally, perhaps, the splinters struck off from
     the metal by hammering. See Slay, v. t.]
     1. The dross, or recrement, of a metal; also, vitrified
        [1913 Webster]
     2. The scoria of a volcano.
        [1913 Webster]
     3. (Metal.) 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.
        [Webster 1913 Suppl.]
     Slag furnace, or Slag hearth (Metal.), a furnace, or
        hearth, for extracting lead from slags or poor ore.
     Slag wool, mineral wool. See under Mineral.
        [1913 Webster]

From The Collaborative International Dictionary of English v.0.48 :

  Slag \Slag\, v. i. & t. [imp. & p. p. Slagged; p. pr. & vb. n.
     Slagging.] (Metal.)
     To form, or form into, a slag; to agglomerate when heated
     below the fusion point.
     [Webster 1913 Suppl.]

From WordNet (r) 3.0 (2006) :

      n 1: the scum formed by oxidation at the surface of molten
           metals [syn: slag, scoria, dross]
      v 1: convert into slag

From Moby Thesaurus II by Grady Ward, 1.0 :

  81 Moby Thesaurus words for "slag":
     alluvion, alluvium, ash, ashes, bones, brand, calx, carbon, chaff,
     charcoal, cinder, clinker, coal, coke, coom, culm, deadwood,
     deposition, deposits, diluvium, dishwater, draff, dregs, dross,
     dust, ember, feces, filings, froth, fume, garbage, gash, grounds,
     hogwash, husks, lava, leavings, lees, loess, moraine, offal,
     offscourings, offscum, orts, parings, potsherds, precipitate,
     precipitation, rags, raspings, reek, refuse, scoria, scourings,
     scrap iron, scraps, scum, sediment, settlings, shards, shavings,
     silt, sinter, slack, slop, slops, smoke, smudge, smut, soot,
     stubble, sublimate, sullage, sweepings, swill, tares, wastage,
     waste, waste matter, wastepaper, weeds

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