[kyoo-puhl, kyoo-pel]
a small, cuplike, porous container, usually made of bone ash, used in assaying, as for separating gold and silver from lead.
a receptacle or furnace bottom in which silver is refined.
verb (used with object), cupeled, cupeling or (especially British) cupelled, cupelling.
to heat or refine in a cupel.

1595–1605; < Medieval Latin cūpella, equivalent to Latin cūp(a) tub + -ella diminutive suffix

cupeler [kyoo-puh-ler] , cupeller [kyoo-pel-er] , noun
cupellation, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cupel (ˈkjuːpəl, kjʊˈpɛl)
1.  a refractory pot in which gold or silver is refined
2.  a small porous bowl made of bone ash in which gold and silver are recovered from a lead button during assaying
vb , -pels, -pelling, -pelled, -pels, -peling, -peled
3.  (tr) to refine (gold or silver) by means of cupellation
[C17: from French coupelle, diminutive of coupecup]

cupellation (ˌkjuːpɪˈleɪʃən)
1.  the process of recovering precious metals from lead by melting the alloy in a cupel and oxidizing the lead by means of an air blast
2.  the manufacture of lead oxide by melting and oxidizing lead

Collins English Dictionary - Complete & Unabridged 10th Edition
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