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pimple copper

American  

noun

Metallurgy.

  1. a form of copper matte about 80 percent pure, somewhat less refined than blister copper.

Etymology

Origin of pimple copper

First recorded in 1865–70

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

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