- (n.) A kind of deep blue, one of the seven prismatic colors.
- (a.) Having the color of, pertaining to or derived from, indigo.
- (n.) A blue dyestuff obtained from several plants belonging to very different genera and orders; as, the woad, Isatis tinctoria, Indigofera tinctoria, I. Anil, Nereum tinctorium, etc. It is a dark blue earthy substance, tasteless and odorless, with a copper-violet luster when rubbed. Indigo does not exist in the plants as such, but is obtained by decomposition of the glycoside indican.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). indigo. Retrieved September 21, 2026, from http://smartdefine.org/indigo/definitions/2020868 |
| Chicago | Webster's. 2011. "indigo" http://smartdefine.org/indigo/definitions/2020868 (accessed September 21, 2026). |
| Harvard | Webster's 2011, indigo, Smart Define, viewed 21 September, 2026, <http://smartdefine.org/indigo/definitions/2020868>. |
| MLA | Webster's. "indigo" 27 May 2011. Web. 21 September 2026. <http://smartdefine.org/indigo/definitions/2020868> |