(n.) A plane figure consisting of seven sides and having seven angles.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). heptagon. Retrieved September 22, 2026, from http://smartdefine.org/heptagon/definitions/2016017 |
| Chicago | Webster's. 2011. "heptagon" http://smartdefine.org/heptagon/definitions/2016017 (accessed September 22, 2026). |
| Harvard | Webster's 2011, heptagon, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/heptagon/definitions/2016017>. |
| MLA | Webster's. "heptagon" 27 May 2011. Web. 22 September 2026. <http://smartdefine.org/heptagon/definitions/2016017> |