Definition of ruthenium noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ruːˈθiːniəm//
; NAmE NAmE//ruːˈθiːniəm//
[uncountable] (symbol Ru)
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a chemical element. Ruthenium is a hard silver-white metal that breaks easily and is found in platinum ores. Word Originmid 19th cent.: modern Latin, from medieval Latin Ruthenia named after the Ruthenes (from medieval Latin Rutheni), a Slavic people, ancestors of the Ukrainians. The metal was so named because it was discovered in ores from the Urals.
See the Oxford Advanced American Dictionary entry: ruthenium