GNU Collaborative International Dictionary of English

Found one definition

      
osmium (ŏzˈmĭ‑ŭm), n. [Gr. ὀσμή a smell, odor, akin to ὄζειν to smell. So named in allusion to the strong chlorinelike odor of osmic tetroxide. See Odor.] (Chem.) A rare metallic element of the platinum group with atomic number 76.  It is 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 190.2.  Specific gravity 22.477.

[1913 Webster +PJC]

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