ru·​the·​ni·​um | \ rü-ˈthē-nē-əm How to pronounce ruthenium (audio) \

Definition of ruthenium

: a rare hard silvery-white metallic element occurring in platinum ores and used especially as a catalyst and to harden alloys — see Chemical Elements Table

Examples of ruthenium in a Sentence

Recent Examples on the Web But in addition to tritium, more dangerous isotopes with longer radioactive lifetimes, such as ruthenium, cobalt, strontium, and plutonium, sometimes slip through the ALPS process, something TEPCO only acknowledged in 2018. Dennis Normile, Science | AAAS, 13 Apr. 2021 Palladium is about 9% below an all-time high, rhodium reached a record $29,800 an ounce this week and ruthenium has rallied to an almost 13-year high. Eddie Spence, Fortune, 27 Mar. 2021 Traces of ruthenium, cobalt, strontium, and plutonium isotopes in the treated water also raise concerns, says Ken Buesseler, a marine chemist at the Woods Hole Oceanographic Institution. Dennis Normile, Science | AAAS, 4 Mar. 2021 The Census Bureau’s count for other precious metals includes silver, platinum, palladium and more obscure sources such as ruthenium and iridium. Dian Zhang, USA TODAY, 3 Mar. 2021 Finnish authorities also reportedly detected small levels of cobalt, ruthenium and cesium in mid-June. Kyle Mizokami, Popular Mechanics, 29 June 2020 The ruthenium atom is solidly attached to a base of molecular groups shaped like a five-petaled flower. Scientific American, 30 Aug. 2019 The chemical element with the atomic number 44 is called ruthenium. Mark Inabinett,, 8 Apr. 2018 Battery materials such as cobalt and steel-hardener vanadium have surged, while minor precious metals like ruthenium rallied too. Thomas Biesheuvel,, 11 Sep. 2017

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ruthenium.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ruthenium

1829, in the meaning defined above

History and Etymology for ruthenium

New Latin, from Medieval Latin Ruthenia Ruthenia

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Time Traveler for ruthenium

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The first known use of ruthenium was in 1829

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Cite this Entry

“Ruthenium.” Dictionary, Merriam-Webster, Accessed 24 Jul. 2021.

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ru·​the·​ni·​um | \ rü-ˈthē-nē-əm How to pronounce ruthenium (audio) \

Medical Definition of ruthenium

: a hard brittle grayish polyvalent rare metallic element occurring in platinum ores and used in hardening platinum alloys symbol Ru — see Chemical Elements Table

More from Merriam-Webster on ruthenium Encyclopedia article about ruthenium


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