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Prince Rupert's metal

American  

noun

  1. a brass composed of from about 60 to 85 percent copper and about 15 to 40 percent zinc, used to imitate gold.

Etymology

Origin of Prince Rupert's metal

First recorded in 1690–1700

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.