from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A refining process for nonoxidizing metals, such as silver and gold, in which a metallic mixture is oxidized at high temperatures and base metals are separated by absorption into the walls of a cupel.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The assaying of precious metal in a cupel.
from the GNU version of the Collaborative International Dictionary of English
- n. The act or process of refining gold or silver, etc., in a cupel.
from The Century Dictionary and Cyclopedia
- n. Separation of gold and silver from lead by treatment in a cupeling-furnace or in a cupel.
From cupel + -ation. (Wiktionary)