osmium

[oz-mee-uh m]
|

noun Chemistry.

a hard, heavy, metallic element having the greatest density of the known elements and forming octavalent compounds, as OsO4 and OsF8: 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.

Nearby words

  1. osmics,
  2. osmidrosis,
  3. osmiophilic,
  4. osmious,
  5. osmiridium,
  6. osmium tetroxide,
  7. osmo-,
  8. osmolality,
  9. osmolarity,
  10. osmole

Origin of osmium

1795–1805; < New Latin < Greek osm(ḗ) smell + -ium -ium; named from the penetrating odor of one of its oxides

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for osmium


British Dictionary definitions for osmium

osmium

noun

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 for osmium

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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for osmium

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

Medicine definitions for osmium

osmium

[ŏzmē-əm]

n. Symbol Os

A hard metallic element, found in small amounts in osmiridium and platinum ores. Atomic number 76.

The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for osmium

osmium

[ŏzmē-əm]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.