(n.) An alkaloid found in the Calabar bean (the seed of Physostigma venenosum), and extracted as a white, tasteless, substance, amorphous or crystalline; -- formerly called eserine, with which it was regarded as identical.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). physostigmine. Retrieved September 23, 2026, from http://smartdefine.org/physostigmine/definitions/2045212 |
| Chicago | Webster's. 2011. "physostigmine" http://smartdefine.org/physostigmine/definitions/2045212 (accessed September 23, 2026). |
| Harvard | Webster's 2011, physostigmine, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/physostigmine/definitions/2045212>. |
| MLA | Webster's. "physostigmine" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/physostigmine/definitions/2045212> |