(n.) A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). thulium. Retrieved September 21, 2026, from http://smartdefine.org/thulium/definitions/2072440 |
| Chicago | Webster's. 2011. "thulium" http://smartdefine.org/thulium/definitions/2072440 (accessed September 21, 2026). |
| Harvard | Webster's 2011, thulium, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/thulium/definitions/2072440>. |
| MLA | Webster's. "thulium" 28 May 2011. Web. 21 September 2026. <http://smartdefine.org/thulium/definitions/2072440> |