billon

billon

[bil-uhn]
noun
1.
an alloy used in coinage, consisting of gold or silver with a larger amount of base metal.
2.
an alloy of silver with copper or the like, used for coins of small denomination.
3.
any coin struck from such an alloy.

Origin:
1720–30; < French: debased metal, orig. ingot, equivalent to Middle French bille log (see billet2) + -on noun suffix

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billon (ˈbɪlən)
 
n
1.  an alloy consisting of gold or silver and a base metal, usually copper, used esp for coinage
2.  any coin made of such an alloy
 
[C18: from Old French: ingot, from bille log; see billet²]

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