Slag (?), 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.
2.
The scoria of a volcano.
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.
© Webster 1913
Slag (?), n. (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
Slag, v. i. & t. [imp. & p. p. Slagged (?); p. pr. & vb. n. Slagging.] (Metal.)
To form, or form into, a slag; to agglomerate when heated below the fusion point.
© Webster 1913