(n.) A metallic element of the rare-earth group, discovered spectroscopically by Demarcay in 1896. Symbol, Eu; at. wt., 152.0.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Europium. Retrieved September 22, 2026, from http://smartdefine.org/europium/definitions/2005223 |
| Chicago | Webster's. 2011. "Europium" http://smartdefine.org/europium/definitions/2005223 (accessed September 22, 2026). |
| Harvard | Webster's 2011, Europium, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/europium/definitions/2005223>. |
| MLA | Webster's. "Europium" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/europium/definitions/2005223> |