(n.) A dyestuff extracted from certain lichens (Roccella tinctoria, Lecanora tartarea, etc.), as a blue amorphous mass which consists of a compound of the alkaline carbonates with certain coloring matters related to orcin and orcein.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). litmus. Retrieved September 25, 2026, from http://smartdefine.org/litmus/definitions/2028383 |
| Chicago | Webster's. 2011. "litmus" http://smartdefine.org/litmus/definitions/2028383 (accessed September 25, 2026). |
| Harvard | Webster's 2011, litmus, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/litmus/definitions/2028383>. |
| MLA | Webster's. "litmus" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/litmus/definitions/2028383> |