Cu"pel (kū"p&ebreve;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). [Written also coppel.]

Cupel dust, powder used in purifying metals.

Cu*pel" (k&usl;*p&ebreve;l"), v. t. [imp. & p. p. Cupelled (-p?ld"); p. pr. & vb. n. Cupelling.] To refine by means of a cupel.