(n.) A reddish brown amorphous dyestuff, /, obtained from orcin, and forming the essential coloring matter of cudbear and archil. It is closely related to litmus.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). Orcein. Retrieved September 25, 2026, from http://smartdefine.org/orcein/definitions/2039270 |
| Chicago | Webster's. 2011. "Orcein" http://smartdefine.org/orcein/definitions/2039270 (accessed September 25, 2026). |
| Harvard | Webster's 2011, Orcein, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/orcein/definitions/2039270>. |
| MLA | Webster's. "Orcein" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/orcein/definitions/2039270> |