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1. (n.) ruthenium
a steel-gray, rare metallic element, belonging to the platinum group of metals.
Etymology: (1840–50; < NL, after Ruthenia (where it was first found in ore); see -ium2)
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| Definition of 'ruthenium' |
Princeton's WordNet |
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1. (noun) ruthenium, Ru, atomic number 44
a rare polyvalent metallic element of the platinum group; it is found associated with platinum
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| Definition of 'ruthenium' |
Webster Dictionary |
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1. (noun) ruthenium
a rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum
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| Definition of 'ruthenium' |
U.S. National Library of Medicine |
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1. ruthenium
A hard, brittle, grayish-white rare earth metal with an atomic symbol Ru, atomic number 44, and atomic weight 101.07. It is used as a catalyst and hardener for PLATINUM and PALLADIUM.
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Definitions of ruthenium 
