(n.) A figure having eleven angles and eleven sides.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). undecagon. Retrieved September 22, 2026, from http://smartdefine.org/undecagon/definitions/2076572 |
| Chicago | Webster's. 2011. "undecagon" http://smartdefine.org/undecagon/definitions/2076572 (accessed September 22, 2026). |
| Harvard | Webster's 2011, undecagon, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/undecagon/definitions/2076572>. |
| MLA | Webster's. "undecagon" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/undecagon/definitions/2076572> |