(n.) A rare element of the vanadium group, first found in a variety of the mineral columbite occurring in Connecticut, probably at Haddam. Atomic weight 94.2. Symbol Cb or Nb. Now more commonly called niobium.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Columbium. Retrieved September 24, 2026, from http://smartdefine.org/columbium/definitions/1989181 |
| Chicago | Webster's. 2011. "Columbium" http://smartdefine.org/columbium/definitions/1989181 (accessed September 24, 2026). |
| Harvard | Webster's 2011, Columbium, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/columbium/definitions/1989181>. |
| MLA | Webster's. "Columbium" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/columbium/definitions/1989181> |