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Osmium

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Webster Dictionary
• Osmium
Encyclopedias
1911 Encyclopedia Britannica
• Osmium

(n.) 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.