Category:Osmium

Os"mi*um, n. Etym: [gr. Odor.] (chem.)

Defn: 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.