osmium(redirected from Osmium compounds)
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n. Symbol Os
A bluish-white, hard, brittle and extremely dense metallic element, found in small amounts in osmiridium, nickel, and platinum ores. It is used as a platinum hardener and in making pen points, phonograph needles, instrument pivots, and other wear-resistant items. Atomic number 76; atomic weight 190.2; melting point 3,033°C; boiling point 5,012°C; specific gravity 22.587; valence 2, 3, 4, 6, 8. See Periodic Table.
[From Greek osmē, smell (from the strong odor of osmium tetroxide).]
(Elements & Compounds) 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
[C19: from Greek osmē smell, so called from its penetrating odour]
os•mi•um(ˈɒz mi əm)
a hard, heavy, metallic element, densest of the known elements, able to form compounds with a valence of eight: used chiefly as a catalyst, in alloys, and in the manufacture of electric-light filaments. Symbol: Os; at. wt.: 190.2; at. no.: 76; sp. gr.: 22.57.
[1795–1805; < New Latin = Greek osm(ḗ) smell + New Latin -ium -ium2; so named from the penetrating odor of one of its oxides]
Symbol Os A hard, brittle, bluish-white metallic element. Osmium is the densest naturally occurring element. It is used to make very hard alloys for fountain pen points and electrical contacts. Atomic number 76. See Periodic Table.
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|Noun||1.||osmium - a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known|