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A shallow porous cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime).

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  1. n. A shallow porous cup, used in refining precious metals, commonly made of bone ashes (phosphate of lime).
  2. v. t. To refine by means of a cupel.
  3. n. a small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead
  4. n a small porous bowl made of bone ash used in assaying to separate precious metals from e.g. lead