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Definition of osmium:

  1. A rare metallic element of the platinum group, 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 191. 1. Specific gravity 22. 477.

Synonyms:

oculus sinister, atomic number 76, Os, operating system, bone.

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