means Osmium is a hard, brittle, bluish-white metal in the platinum group, the densest naturally occurring element, used in tiny amounts for hard alloys like fountain-pen nib tips and electrical contacts.

from From the Greek 'osme,' meaning smell or odor — named in the early 1800s by the English chemist Smithson Tennant, who isolated it from the gritty residue left when platinum ore is dissolved. The name nods to its volatile oxide, osmium tetroxide, which gives off a sharp, irritating, chlorine-like stench. So this proudest, heaviest of metals is, etymologically, simply 'the stinky one.'