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ruthenium

[roo-thee-nee-uh m, -theen-yuh m] /ruˈθi ni əm, -ˈθin yəm/
noun, Chemistry
1.
a steel-gray, rare metallic element, belonging to the platinum group of metals. Symbol: Ru; atomic weight: 101.07; atomic number: 44; specific gravity: 12.2 at 20°C.
Origin
1840-1850
1840-50; < Neo-Latin, named after Ruthenia (from the fact that it was first found in ore from the region); see -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for ruthenium
  • All it takes is a catalyst of nickel or ruthenium, and the reaction occurs spontaneously.
  • But this compound includes ruthenium, a rare and expensive element.
  • Its high cost comes mainly from the platinum and ruthenium used as catalysts.
British Dictionary definitions for ruthenium

ruthenium

/ruːˈθiːnɪəm/
noun
1.
a hard brittle white element of the platinum metal group. It occurs free with other platinum metals in pentlandite and other ores and is used to harden platinum and palladium. Symbol: Ru; atomic no: 44; atomic wt: 101.07; valency: 0–8; relative density: 12.41; melting pt: 2334°C; boiling pt: 4150°C
Word Origin
C19: from Medieval Latin Ruthenia Russia, where it was first discovered
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for ruthenium
n.

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).

Online Etymology Dictionary, © 2010 Douglas Harper
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ruthenium in Medicine

ruthenium ru·the·ni·um (rōō-thē'nē-əm)
n.
Symbol Ru
A hard acid-resistant metallic element that is found in platinum ores. Atomic number 44; atomic weight 101.07; melting point 2,334°C; boiling point 4,150°C; specific gravity 12.41; valence 0, 1, 2, 3, 4, 5, 6, 7, 8.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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ruthenium in Science
ruthenium
  (r-thē'nē-əm)   
Symbol Ru
A rare, silvery-gray metallic element that is hard, brittle, and very resistant to corrosion. It is used to harden alloys of platinum and palladium for jewelry and electrical contacts. Atomic number 44; atomic weight 101.07; melting point 2,310°C; boiling point 3,900°C; specific gravity 12.41; valence 0, 1, 2, 3, 4, 5, 6, 7, 8. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for ruthenium

Ru

(Ru), chemical element, one of the platinum metals of Group VIII of the periodic table, used as an alloying agent to harden platinum and palladium. Silver-gray ruthenium metal looks like platinum but is rarer, harder, and more brittle. The Russian chemist Karl Karlovich Klaus established (1844) the existence of this rare metal and retained the name his countryman Gottfried Wilhelm Osann had suggested (1828) for a platinum-group element whose discovery had remained inconclusive. Elemental ruthenium occurs in native alloys of iridium and osmium: up to 14.1 percent in iridosmine and 18.3 percent in siserskite. It also occurs in sulfide and other ores (e.g., in pentlandite of the Sudbury, Ont., Can., nickel-mining region) in very small quantities that are commercially recovered

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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