SLAG

slag. Slag, n. the dross or refuse of metals

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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. 1. The dross, or recrement, of a metal; also, vitrified cinders.
2. 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.