From The Collaborative International Dictionary of English v.0.48 [gcide]:
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
cinders.
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2. The scoria of a volcano.
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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}.
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From The Collaborative International Dictionary of English v.0.48 [gcide]:
Cinder \Cin"der\ (s[i^]n"d[~e]r), n. [AS. sinder slag, dross;
akin to Icel. sindr dross, Sw. sinder, G. sinter, D. sintel;
perh. influenced by F. cendre ashes, fr. L. cinis. Cf.
{Sinter}.]
1. Partly burned or vitrified coal, or other combustible, in
which fire is extinct.
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2. A hot coal without flame; an ember. --Swift.
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3. A scale thrown off in forging metal.
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4. The slag of a furnace, or scoriaceous lava from a volcano.
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{Cinder frame}, a framework of wire in front of the tubes of
a locomotive, to arrest the escape of cinders.
{Cinder notch} (Metal.), the opening in a blast furnace,
through which melted cinder flows out.
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From WordNet (r) 3.0 (2006) [wn]:
cinder
n 1: a fragment of incombustible matter left after a wood or
coal or charcoal fire [syn: {cinder}, {clinker}]
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