
1) Payment system 2) Precious metal alloy
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https://www.crosswordclues.com/clue/billon
[alloy] Billon ən is an alloy of a precious metal (most commonly silver, but also mercury) with a majority base metal content (such as copper). It is used chiefly for making coins, medals, and token coins. The word comes from the French bille, which means `log`. The use of billon coins dates from ancient Greece and continued through the Mi...
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http://en.wikipedia.org/wiki/Billon_(alloy)

base metal, alloy of copper, tin or silver
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http://phrontistery.info/b.html

• (n.) An alloy of gold and silver with a large proportion of copper or other base metal, used in coinage.
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http://thinkexist.com/dictionary/meaning/billon/

A mixture of silver and copper, from which small coins were made in medieval Europe. Larger coins were made of silver or gold. Source: Thomas J Sargent and Francois R Velde, 1997, 'The Evolution of Small Change', unpublished paper, p. 6
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http://www.econterms.com/glossary.cgi?query=billon

A low-grade alloy of silver and other metals, usually copper, which is used in minor coinage.
Found on
http://www.encyclo.co.uk/local/10142

A low-grade alloy used for some minor coin issues consisting usually of a mixture of silver and copper, and sometimes coated with a silver wash.
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http://www.encyclo.co.uk/local/10143
Bil`lon' noun [ French Confer
Billet a stick.] An alloy of gold and silver with a large proportion of copper or other base metal, used in coinage.
Found on
http://www.encyclo.co.uk/webster/B/52

Billon is an alloy of copper and silver, in which the former predominates, formerly used in some countries for coins of low value, the object being to avoid the bulkiness of pure copper coin.
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http://www.probertencyclopaedia.com/browse/GB.HTM

Low-grade alloy of gold or silver with a high percentage of another metal, usually copper.
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http://www.translationdirectory.com/glossaries/glossary100.htm

An alloy of copper and silver with more than 50% copper.
Found on
https://www.encyclo.co.uk/local/20687

an alloy used in coinage, consisting of gold or silver with a larger amount of base metal. · an alloy of silver with copper or the like, used for coins of small denomination. · any coin struck from such an alloy.
Found on
https://www.infoplease.com/dictionary/billon
No exact match found.