(n.) A rare element of the light platinum group, found associated with platinum ores, and isolated as a hard, brittle steel-gray metal which is very infusible. Symbol Ru. Atomic weight 103.5. Specific gravity 12.26. See Platinum metals, under Platinum.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). ruthenium. Retrieved September 27, 2026, from http://smartdefine.org/ruthenium/definitions/2057155 |
| Chicago | Webster's. 2011. "ruthenium" http://smartdefine.org/ruthenium/definitions/2057155 (accessed September 27, 2026). |
| Harvard | Webster's 2011, ruthenium, Smart Define, viewed 27 September, 2026, <http://smartdefine.org/ruthenium/definitions/2057155>. |
| MLA | Webster's. "ruthenium" 28 May 2011. Web. 27 September 2026. <http://smartdefine.org/ruthenium/definitions/2057155> |