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3 definitions found
 for osmium
From The Collaborative International Dictionary of English v.0.48 :

  osmium \os"mi*um\ ([o^]z"m[i^]*[u^]m), n. [Gr. 'osmh` a smell,
     odor, akin to 'o`zein to smell. So named in allusion to the
     strong chlorinelike odor of osmic tetroxide. See Odor.]
     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.
     [1913 Webster +PJC]

From WordNet (r) 3.0 (2006) :

      n 1: a hard brittle blue-grey or blue-black metallic element
           that is one of the platinum metals; the heaviest metal
           known [syn: osmium, Os, atomic number 76]

From The Elements (07Nov00) :

  Symbol: Os
  Atomic number: 76
  Atomic weight: 190.2
  Hard blue-white metallic transition element. Found with platinum and
  in some alloys with platinum and iridium.

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