bimetallism

noun

1. a monetary standard under which the basic unit of currency is defined by stated amounts of two metals (usually gold and silver) with values set at a predetermined ratio
   Terjemahkan ke Indonesia sumber: wordnet30
2. The legalized use of two metals (as gold and silver) in the currency of a country, at a fixed relative value; -- in opposition to monometallism.
   Terjemahkan ke Indonesia sumber: webster1913