cu·pel /kjuˈpɛl, ˈkjupəl/
 骨灰所制的坩鍋,試金用灰皿(vt.)用灰皿提煉


 Cu·pel n.  A shallow porous cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime). [Written also coppel.]
 Cupel dust, powder used in purifying metals.


 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]