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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 of ruthenium
1840-1850
1840-50; < New 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. 2015.
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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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