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noun bil·lon \ˈbi-lən\

Definition of billon

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

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

Origin and Etymology of billon

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

First Known Use: circa 1727

Rhymes with billon

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