(n.) The first or anterior segment of the thorax in insects. See Illusts. of Butterfly and Coleoptera.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). prothorax. Retrieved September 24, 2026, from http://smartdefine.org/prothorax/definitions/2050223 |
| Chicago | Webster's. 2011. "prothorax" http://smartdefine.org/prothorax/definitions/2050223 (accessed September 24, 2026). |
| Harvard | Webster's 2011, prothorax, Smart Define, viewed 24 September, 2026, <http://smartdefine.org/prothorax/definitions/2050223>. |
| MLA | Webster's. "prothorax" 27 May 2011. Web. 24 September 2026. <http://smartdefine.org/prothorax/definitions/2050223> |