(n.) A yellowish red, crystalline substance, C20H12O5, produced by heating together phthalic anhydride and resorcin; -- so called, from the very brilliant yellowish green fluorescence of its alkaline solutions. It has acid properties, and its salts of the alkalies are known to the trade under the name of uranin.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). fluorescein. Retrieved September 25, 2026, from http://smartdefine.org/fluorescein/definitions/2008935 |
| Chicago | Webster's. 2011. "fluorescein" http://smartdefine.org/fluorescein/definitions/2008935 (accessed September 25, 2026). |
| Harvard | Webster's 2011, fluorescein, Smart Define, viewed 25 September, 2026, <http://smartdefine.org/fluorescein/definitions/2008935>. |
| MLA | Webster's. "fluorescein" 27 May 2011. Web. 25 September 2026. <http://smartdefine.org/fluorescein/definitions/2008935> |