(n.) A supposed new element of the rare-earth group, accompanying lutecium and scandium in the gadolinite earths. Symbol, Ct (no period).
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). celtium. Retrieved September 25, 2026, from http://smartdefine.org/celtium/definitions/1985663 |
| Chicago | Webster's. 2011. "celtium" http://smartdefine.org/celtium/definitions/1985663 (accessed September 25, 2026). |
| Harvard | Webster's 2011, celtium, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/celtium/definitions/1985663>. |
| MLA | Webster's. "celtium" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/celtium/definitions/1985663> |