- 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.
Origin of osmium
Examples from the Web for osmium
But the osmium and uranium alloyed with it are something else.The Planet Strappers
Raymond Zinke Gallun
The osmium filament appeared in 1905 and its invention is due to Welsbach, who had produced the marvelous gas-mantle.
Owing to its extreme brittleness, osmium was finely divided and made into a paste of organic material.
The telephone relay consists of a microphone C, Fig. 25, formed of the two pieces of osmium iridium alloy.Wireless Transmission of Photographs
Marcus J. Martin
An alloy of iridium and osmium (artificial or native) has been employed for tipping the nibs of gold pens (everlasting pens).Cooley's Practical Receipts, Volume II
- 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 and History for osmium
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.
- A hard metallic element, found in small amounts in osmiridium and platinum ores. Atomic number 76.
- 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.