Source : Webster's Revised Unabridged Dictionary (1913)

Cupel \Cu*pel"\ (k[-u]*p[e^]l"), v. t. [imp. & p. p. {Cupelled}
   (-p?ld"); p. pr. & vb. n. {Cupelling}.]
   To refine by means of a cupel.

Source : WordNet®

cupelling
     See {cupel}

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}]