Webster's English Dictionary

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cupel

1. cu.pel \kyu:-'pel, 'kyu:-p*l\ n [F coupelle, dim. of coupe cup, fr. LL 
   cuppa] : a small shallow porous cup esp. of bone ash used in assaying to 
   separate  precious metals from lead
2. cupel or cu.pel.er \kyu:-'pel-*r, 'kyu:-p*-l*r\ vt or cu.pelled or 
   cu.peled;  or cu.pel.ling;  or cu.pel.ing : to refine by means of a cupel  
   - cu.pel.ler n