from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The vitreous mass left as a residue by the smelting of metallic ore.
  • n. See scoria.
  • transitive v. To change into or form slag.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Waste material from a coal mine.
  • n. Scum that forms on the surface of molten metal.
  • n. Impurities formed and separated out when a metal is smelted from ore; vitrified cinders (Wikipedia).
  • n. Hard aggregate remaining as a residue from blast furnaces, sometimes used as a surfacing material.
  • n. Scoria associated with a volcano.
  • n. A coward.
  • n. A contemptible person, a scumbag.
  • n. A prostitute.
  • n. A woman (sometimes a man) who has loose morals relating to sex; a slut.
  • v. To produce slag.
  • v. To talk badly about; to malign or denigrate (someone).
  • v. To spit.

from the GNU version of the Collaborative International Dictionary of English

  • n. The dross, or recrement, of a metal; also, vitrified cinders.
  • n. The scoria of a volcano.
  • n. 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.
  • v. To form, or form into, a slag; to agglomerate when heated below the fusion point.

from The Century Dictionary and Cyclopedia

  • To form a slag, or to cohere when heated so as to become a slag-like mass.
  • In metal: To convert into slag: as, an excess of limestone used as a flux may to a greater or less extent slag the lining of a furnace.
  • To cake together as the result of chemical action at a heat lower than that of fusion.
  • n. The earthy matter separated, in a more or less completely fused and vitrified condition, during the reduction of a metal from its ore.
  • n. The scoria of a volcano.
  • n. A hollow or depression of land.
  • n. In the puddling process for making wrought-iron, the slag which forms when, as a preliminary step not always taken, air is blown down upon the surface of a charge of melted cask iron in a specially constructed hearth. Silicon is the principal substance removed from the iron, and the slag consists mainly of ferrous silicate.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • v. convert into slag
  • n. the scum formed by oxidation at the surface of molten metals


from The American Heritage® Dictionary of the English Language, 4th Edition

Low German slagge, from Middle Low German.

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Swedish slagg, or Middle Low German slacke, whence German Schlacke; originally, perhaps, the splinters struck off from the metal by hammering; compare slay.



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  • a loose woman

    July 23, 2008

  • Yes. It's truly amazing that 72 percent of the time subjects can guess if a person is an oxidized metallic scum.

    April 10, 2008

  • ...whether the person was the scum formed by oxidization at the surface of molten metals?


    April 10, 2008

  • "Other students were then asked to look at the photographed faces and say how easy they reckoned the pictured individual might be. In a staggering 72 per cent of cases, they correctly guessed whether the person in the portrait was or was not a slag."

    The Register, Faces give away giveaways - psych profs' amazing claim, April 9, 2008

    April 10, 2008