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osmium

[oz-mee-uh m] /ˈɒz mi əm/
noun, Chemistry
1.
a hard, heavy, metallic element having the greatest density of the known elements and forming octavalent compounds, as OsO 4 and OsF 8 : used chiefly as a catalyst, in alloys, and in the manufacture of electric-light filaments. Symbol: Os; atomic weight: 190.2; atomic number: 76; specific gravity: 22.57.
Origin of osmium
1795-1805
1795-1805; < New Latin < Greek osm() smell + -ium -ium; named from the penetrating odor of one of its oxides
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for osmium

osmium

/ˈɒzmɪəm/
noun
1.
a very hard brittle bluish-white metal occurring with platinum and alloyed with iridium in osmiridium: used to produce platinum alloys, mainly for pen tips and instrument pivots, as a catalyst, and in electric-light filaments. Symbol: Os; atomic no: 76; atomic wt: 190.2; valency: 0 to 8; relative density: 22.57; melting pt: 3033±30°C; boiling pt: 5012±100°C
Word Origin
C19: from Greek osmē smell, so called from its penetrating odour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for osmium
n.

metallic element, 1803, coined in Modern Latin by its discoverer, English chemist Smithson Tennant (1761-1815) from Greek osme "smell, scent, odor" good or bad (cognate with Latin odor; see odor). So called for the strong smell of its oxide.

Online Etymology Dictionary, © 2010 Douglas Harper
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osmium in Medicine

osmium os·mi·um (ŏz'mē-əm)
n.
Symbol Os
A hard metallic element, found in small amounts in osmiridium and platinum ores. Atomic number 76; atomic weight 190.2; melting point 3,000°C; boiling point 5,000°C; specific gravity 22.57; valence 3, 4, 6, 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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osmium in Science
osmium
  (ŏz'mē-əm)   
Symbol Os
A hard, brittle, bluish-white metallic element that is the densest naturally occurring element. It is used to make very hard alloys for fountain pen points, electrical contacts, and instrument pivots. Atomic number 76; atomic weight 190.2; melting point 3,000°C; boiling point 5,000°C; specific gravity 22.57; valence 2, 3, 4, 8. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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