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Prince Rupert's metal

noun

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

Origin of Prince Rupert's metal

First recorded in 1690–1700

Also called Prince's metal.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019