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English word
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WORDNET DICTIONARY
CIDE DICTIONARY
OXFORD DICTIONARY
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WORDNET DICTIONARY
Noun ruthenium has 1 sense
- ruthenium(n = noun.substance) atomic number 44, ru - a rare polyvalent metallic element of the platinum group; it is found associated with platinum; is a kind of metal, metallic element
CIDE DICTIONARY
ruthenium, n. [NL. So named from the Ruthenians , a Little Russian people, as coming from Russia, the metal having been found in the Ural mountains.].
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. [1913 Webster]
OXFORD DICTIONARY
ruthenium, n. Chem. a rare hard white metallic transition element, occurring naturally in platinum ores, and used as a chemical catalyst and in certain alloys.
Usage
Symb.: Ru.
Etymology
med.L Ruthenia Russia (from its discovery in ores from the Urals)