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  1. Oxford Dictionary

    platinum metals

    • plural
      the six metals platinum, palladium, ruthenium, osmium, rhodium, and iridium, which have similar properties and tend to occur together in nature.

    • noun: platinum metal, plural noun: platinum metals

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    platinum metals

    • IPA[ˈpladənəm]
    • plural
      the six metals platinum, palladium, ruthenium, osmium, rhodium, and iridium, which have similar ...

    Oxford American Dictionary