osmium
n. வெண்மக் குழுவினைச் சார்ந்த எடையில் எல்லாப் பொருள்களையும் விஞ்சிய உலோக வகை.
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.