Cu·pel v. t. [imp. & p. p. Cupelled p. pr. & vb. n. Cupelling.] To refine by means of a cupel.
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  cupel
       n : small porous bowl made of bone ash used in assaying to
           separate precious metals from e.g. lead [syn: bone-ash
           cup, refractory pot]
       [also: cupelling, cupelled]