Meaning of OSMIUM in English

noun 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.

Webster English vocab.      Английский словарь Webster.