Found 2 items, similar to ruthenium.
English → English (WordNet) Definition: ruthenium ruthenium n : a rare polyvalent metallic element of the platinum group; it is found associated with platinum [syn: Ru, atomic number 44 ]
English → English (gcide) Definition: Ruthenium Ruthenium \Ru*the"ni*um\, n. [NL. So named from the Ruthenians, a Little Russian people, as coming from Russia, the metal having been found in the Ural mountains.] (Chem.) 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]