the scum formed by oxidation at the surface of molten metals
source: WordNet 3.0
The dross, or recrement, of a metal; also, vitrified cinders.
source: Webster 1913
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.
source: Webster 1913
verb
convert into slag
source: WordNet 3.0
To form, or form into, a slag; to agglomerate when heated below the fusion point.