copple dust en · NOUN
Meanings
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(obsolete, uncountable) Cupel-dust; powder used in refining metals, or the gross parts separated by the coppel.
It may be also tried , by incorporating powder of steel , or copple-dust , by pouncing into the quick - silver , and so to proceed to the stupifying UPON glass
a. 1626, Francis Bacon, Inquisitions touching the compounding of metals: