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Entry 2 senses · 2 variants Webster, 1913

Cupel

/(kū"pĕl)/ · Cu·pel · IPA /ˈkjuːpəl/
01 n. A shallow porous cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime).
  1. 1.
    A shallow porous cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime).
Phrases & compounds
Cupel dust — powder used in purifying metals.
02 v. t. To refine by means of a cupel.
imp. & p. p. Cupelled; p. pr. & vb. n. Cupelling
  1. 1.
    To refine by means of a cupel.