ALMOND-FURNACE, among refiners, is a furnace in which the slags of litharge, left in refining silver, are reduced to lead, by the help of charcoal; that is, according to modern chimistry, in which the oxyd of lead is deoxydized, and the metal revived.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI