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Definition of: slag
(slag) noun
1. Metall. a The fused residue separated in the reduction of ores; metallic dross. b A basic iron silicate that floats on the surface of molten iron.
2. Volcanic scoria.
—v.t. & v.i. slagged, slag·ging To form into slag. [<MLG slagge]
—slag′gy adjective
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