Meaning of polymetallism in English:
polymetallism
Pronunciation /ˌpɒlɪˈmɛtəlɪz(ə)m/ /ˌpɒlɪˈmɛt(ə)lɪz(ə)m/
noun
The use of several different metals, especially for coinage.
Origin
Late 19th century; earliest use found in The Times. After bimetallism.