(n.) Clay that is colored red or brown by the oxides of iron or manganese, and used as a pigment. It is used either in the raw state or burnt.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). sienna. Retrieved September 22, 2026, from http://smartdefine.org/sienna/definitions/2061895 |
| Chicago | Webster's. 2011. "sienna" http://smartdefine.org/sienna/definitions/2061895 (accessed September 22, 2026). |
| Harvard | Webster's 2011, sienna, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/sienna/definitions/2061895>. |
| MLA | Webster's. "sienna" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/sienna/definitions/2061895> |