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[slag] /slæg/
Also called cinder. the more or less completely fused and vitrified matter separated during the reduction of a metal from its ore.
the scoria from a volcano.
waste left over after the re-sorting of coal.
verb (used with object), slagged, slagging.
to convert into slag.
Metallurgy. to remove slag from (a steel bath).
verb (used without object), slagged, slagging.
to form slag; become a slaglike mass.
Origin of slag1
1545-55; < Middle Low German slagge; cognate with German Schlacke dross, slag; see slack2
Related forms
slagable, adjective
slagability, noun
slagless, adjective
slaglessness, noun
unslagged, adjective


[slag] /slæg/
British Slang. an abusive woman.
1780-90; originally an argot word for a worthless person or a thug; perhaps identical with slag1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for slag
  • The syngas rises through the pool, heavy metals sink to the bottom and other contaminants form a slag on top.
  • Miracle of miracles, there in the slag was a perfectly shaped arrowhead.
  • With that in mind, it seems a good time to survey the slag heap that is the telecom stock sector.
  • Metals and other inorganic materials that do not turn into gas fall to the bottom of the chamber as molten slag.
  • The only problem is that slag rarely has crystals inside of it.
  • He and other researchers satisfied themselves that the slabs were not merely slag from metal or pottery furnaces.
  • One can almost imagine the fossil-fuel industry laughing all the way to the slag pile.
  • Some wax cylinders and discs, metal tape, vinyl records and other formats have already begun disintegrating or are slag.
  • The ship was carrying furnace slag, a near valueless cargo.
  • They are thus ill-adapted for lower-quality coals that would produce several times more slag.
British Dictionary definitions for slag


Also called cinder. the fused material formed during the smelting or refining of metals by combining the flux with gangue, impurities in the metal, etc. It usually consists of a mixture of silicates with calcium, phosphorus, sulphur, etc See also basic slag
a mass of rough fragments of pyroclastic rock and cinders derived from a volcanic eruption; scoria
a mixture of shale, clay, coal dust, and other mineral waste produced during coal mining
(Brit, slang) a coarse or dissipated girl or woman
verb slags, slagging, slagged
(transitive) (Brit, slang) (usually foll by off) to abuse (someone) verbally
(intransitive) (Austral, slang) to spit
Derived Forms
slagging, noun
slaggy, adjective
Word Origin
C16: from Middle Low German slagge, perhaps from slagen to slay
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for slag

"refuse from smelting," 1550s, from Middle Low German slagge (German Schlacke) "splinter flying off when metal is struck," related to Old High German slahan "to strike, slay" (see slay (v.)).


"denigrate," by 1971, from slag (n.) in a secondary sense of "worthless person" (1788). Related: Slagged; slagging.

Online Etymology Dictionary, © 2010 Douglas Harper
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slag in Science
The vitreous mass left as a residue by the smelting of metallic ore. It consists mostly of the siliceous and aluminous impurities from the iron ore.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Slang definitions & phrases for slag



: this lame ''slacker'' attitude a la Jeff Spicoli from Fast Times at Ridgemont High


An indolent and detached person; shirker; idler: The epitome of the slang-slinging, wise-cracking slacker (1898+)

[revived in the 1990s to describe a sort of cultural anomie]

The Dictionary of American Slang, Fourth Edition by Barbara Ann Kipfer, PhD. and Robert L. Chapman, Ph.D.
Copyright (C) 2007 by HarperCollins Publishers.
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