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ˌcupeˈllation

British  
/ ˌkjuːpɪˈleɪʃən /

noun

  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

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.