Osmium

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  • noun. 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. cross-reference: Periodic Table.
    • The Century Dictionary and Cyclopedia
  • noun. Chemical symbol, Os; atomic weight, 191. One of the metals of the platina group.
  • noun. This, the most refractory of the metals, has, though with difficulty, been completely fused into globules by means of the electric furnace.
    • the GNU version of the Collaborative International Dictionary of English
  • noun. A rare metallic element of the platinum group with atomic number 76. It is found native as an alloy in platinum ore, and in iridosmine. It is a hard, infusible, bluish or grayish white metal, and the heaviest substance known. Its tetroxide is used in histological experiments to stain tissues. Symbol os. Atomic weight 190.2. Specific gravity 22.477.
    • Wiktionary, Creative Commons Attribution/Share-Alike License
  • noun. a heavy metallic chemical element (symbol Os) with an atomic number of 76
    • WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
  • noun. a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
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