billon

noun
bil·​lon | \ˈbi-lən \

Definition of billon 

1 : gold or silver heavily alloyed with a less valuable metal

2 : an alloy of silver containing more than 50 percent of copper by weight

First Known Use of billon

1716, in the meaning defined at sense 1

History and Etymology for billon

French, from Middle French, from bille log — more at billet

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The first known use of billon was in 1716

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