{Cupel dust}, powder used in purifying metals. [1913 Webster]
The Collaborative International Dictionary of English. 2000.
Cupel — Cu pel (k[=u] p[e^]l), n. [LL. cupella cup (cf. L. cupella, small cask, dim. of cupa) : cf. F. coupelle. See {Cup}, and cf. {Coblet}.] A shallow porous cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime).… … The Collaborative International Dictionary of English
Copple dust — Cop ple dust Cupel dust. [Obs.] [1913 Webster] Powder of steel, or copple dust. Bacon. [1913 Webster] … The Collaborative International Dictionary of English
coppel — Cupel Cu pel (k[=u] p[e^]l), n. [LL. cupella cup (cf. L. cupella, small cask, dim. of cupa) : cf. F. coupelle. See {Cup}, and cf. {Coblet}.] A shallow porous cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime).… … The Collaborative International Dictionary of English
