A rare polyvalent metallic element of the platinum group

• Element number 55-Across
• Element name derived from the Latin for "Russia"
• It is found associated with platinum

Wikipedia Word definitions in Wikipedia
Ruthenium is a chemical element with symbol Ru and atomic number 44. It is a rare transition metal belonging to the platinum group of the periodic table . Like the other metals of the platinum group, ruthenium is inert to most other chemicals. The Baltic ...

WordNet Word definitions in WordNet
n. a rare polyvalent metallic element of the platinum group; it is found associated with platinum [syn: Ru , atomic number 44 ]

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
metallic element, 1845, named by Russian chemist Karl Klauss, from a name proposed earlier (1828) in reference to a metal extracted from ores from the Ural Mountains of Russia (see Ruthenian ).

Wiktionary Word definitions in Wiktionary
n. 1 A metallic chemical element (''symbol'' Ru) with an atomic number of 44. 2 (cx countable English) An atom of this element.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
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, ...