noun
- An eleven-sided polygon. .
WordNet 3.0 © 2006 by Princeton University
| APA | WordNet. (2010). undecagon. Retrieved September 21, 2026, from http://smartdefine.org/undecagon/definitions/1244813 |
| Chicago | WordNet. 2010. "undecagon" http://smartdefine.org/undecagon/definitions/1244813 (accessed September 21, 2026). |
| Harvard | WordNet 2010, undecagon, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/undecagon/definitions/1244813>. |
| MLA | WordNet. "undecagon" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/undecagon/definitions/1244813> |