(n.) A rare metallic element, of uncertain identification, supposed to exist in certain minerals, as gadolinite and samarskite, with other rare ytterbium earth. Symbol Tr or Tb. Atomic weight 150.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). terbium. Retrieved September 23, 2026, from http://smartdefine.org/terbium/definitions/2071263 |
| Chicago | Webster's. 2011. "terbium" http://smartdefine.org/terbium/definitions/2071263 (accessed September 23, 2026). |
| Harvard | Webster's 2011, terbium, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/terbium/definitions/2071263>. |
| MLA | Webster's. "terbium" 28 May 2011. Web. 23 September 2026. <http://smartdefine.org/terbium/definitions/2071263> |