Also found in: Dictionary, Thesaurus, Encyclopedia, Wikipedia.
Related to physostigma: Physostigma venenosum, physostigmine


The dried seed of Physostigma venenosum (family Leguminosae), a vine of western Africa; it contains the alkaloids physostigmine (eserine), eseramine, eseridine (geneserine) and physovenine; at toxic doses, it causes vomiting, colic, salivation, diarrhea, convulsions, sweating, dyspnea, vertigo, slow pulse, and extreme prostration.
[G. physa, bellows, + stigma, a mark, spot; so called because of the shape of the stigma]