(n.) A rare metallic element, occurring in the minerals cerite, allanite, monazite, etc. Symbol Ce. Atomic weight 141.5. It resembles iron in color and luster, but is soft, and both malleable and ductile. It tarnishes readily in the air.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). cerium. Retrieved September 23, 2026, from http://smartdefine.org/cerium/definitions/1985929 |
| Chicago | Webster's. 2011. "cerium" http://smartdefine.org/cerium/definitions/1985929 (accessed September 23, 2026). |
| Harvard | Webster's 2011, cerium, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/cerium/definitions/1985929>. |
| MLA | Webster's. "cerium" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/cerium/definitions/1985929> |