Definition of slag in English:


Syllabification: slag
Pronunciation: /slag


  • 1Stony waste matter separated from metals during the smelting or refining of ore.
    More example sentences
    • The hardened matter was slag, a waste product from metal working, and contained evidence of iron, copper and lead manufacture.
    • In highly developed countries, the major components of industrial waste are blast furnace and steel slag, and power station ash.
    • The union has leveled 15 separate charges against Levy, a contractor at Mittal Steel USA, which performs slag processing and metal reclamation.
  • 1.1Similar material produced by a volcano; scoria.
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    • Thirdly, reduce the clinker content in cement, by intergrinding cementious material like slag, fly ash, or limestone.
    • The difference in densities of the molten iron and molten slag allow each material to be removed separately from the furnace.
    • It was a more rustic and northern version of Detroit with escarpments of slag and iron ore.
  • 2British informal derogatory A promiscuous woman.
    More example sentences
    • Boys continued to make the same distinction between prospective wives and slags.
    • If you look beyond the dehumanising stereotypes to the hard facts, it emerges that females in jail are not conniving slags.
    • She told him Trev had called her a dirty slag after their drink the other night and had refused to sleep with her.

verb (slags, slagging, slagged)

[no object] (usually as noun slagging) Back to top  
  • Produce deposits of slag.



adjective (slaggier, slaggiest)
More example sentences
  • The whole of it waggled with unhealthy cushions of fat; it all hung, it was all slack and without structure - slaggy, gelatinous, sick.
  • Everyone must have some sympathy with Bible Belters and Muslims who point to the slaggy decadence of secular western culture.


mid 16th century: from Middle Low German slagge, perhaps from slagen 'strike', with reference to fragments formed by hammering.

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