bi·met·al·lism 
(bī-mĕtl-ĭz′əm)
(bī-mĕtl-ĭz′əm)n.
1. The use of a monetary standard consisting of two metals, especially gold and silver, in a fixed ratio of value.
2. The doctrine advocating bimetallism.
bi·metal·list n.
bi·met′al·listic adj.