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blister copper

American

noun

Metallurgy.

a matte of from 96 to 99 percent copper, having a blistered surface after smelting because of gases generated during solidification.

blister copper British

noun

an impure form of copper having a blister-like surface due to the release of gas during cooling

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of blister copper

First recorded in 1860–65

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023