(n.) 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's Revised Unabridged Dictionary
| APA | Webster's. (2011). osmium. Retrieved September 24, 2026, from http://smartdefine.org/osmium/definitions/2039702 |
| Chicago | Webster's. 2011. "osmium" http://smartdefine.org/osmium/definitions/2039702 (accessed September 24, 2026). |
| Harvard | Webster's 2011, osmium, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/osmium/definitions/2039702>. |
| MLA | Webster's. "osmium" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/osmium/definitions/2039702> |