from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A hard silver-gray acid-resistant metallic element that is found in platinum ores and is used to harden platinum and palladium for jewelry and in alloys for nonmagnetic wear-resistant instrument pivots 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 Table at element.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a metallic chemical element (symbol Ru) with an atomic number of 44.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. Chemical symbol, Ru; atomic weight, 103.5 (Claus). A metal of the platinum group.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a rare polyvalent metallic element of the platinum group; it is found associated with platinum
From Medieval Latin Ruthenia, Russia, from Ruthenī, Russians, from Russian Rusin, from Old Russian Rusĭ, Russian; see Russian.(American Heritage® Dictionary of the English Language, Fourth Edition)
Ruthenia + -ium (Wiktionary)