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

 

ruthenium

 noun
noun
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 Origin mid 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