[ roo-thee-nee-uh m, -theen-yuh m ]
/ ruˈθi ni əm, -ˈθin yəm /
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.
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Examples from the Web for ruthenium
In Fremys process for separating osmium from the residues of platinum ore, ruthenium occurs in a dioxide.Cooley's Practical Receipts, Volume II|Arnold Cooley
The lower ovoids in ruthenium are identical in composition, with those of iron, cobalt and nickel and may be studied under Iron.Occult Chemistry|Annie Besant and Charles W. Leadbeater
British Dictionary definitions for ruthenium
/ (ruːˈθiːnɪəm) /
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 for ruthenium
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
Medicine definitions for ruthenium
[ rōō-thē′nē-əm ]
n. Symbol Ru
A hard acid-resistant metallic element that is found in platinum ores. Atomic number 44.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for ruthenium
[ rōō-thē′nē-əm ]
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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.