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os·mi·um  (  z  m  -  m) KEY NOUN: Symbol Os- A bluish-white, hard 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, 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 Table at element.
ETYMOLOGY:From Greek osm , smell (from the strong odor of osmium tetroxide)
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