a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
A chemical element (symbol Os) with atomic number 76: a hard, brittle, heavy, bluish-white transition metal found as a trace element in alloys, mostly in platinum ores.
The name osmium comes from the Ancient Greek word for "smell," referring to the pungent odor of its oxide. The element's name was formed by adding the suffix -ium to this root.