The American Heritage® Dictionary of the English Language, 4th Edition
n. A crystalline alkaloid, C15H21N3O2, extracted from the Calabar bean, used in medicine as a miotic and cholinergic agent and to enhance memory in patients with Alzheimer's disease. Also called eserine.
n. A parasympathomimetic, a reversible cholinesterase inhibitor alkaloid of the Calabar bean, used to treat certain medical conditions.
the GNU version of the Collaborative International Dictionary of English
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.
The Century Dictionary and Cyclopedia
n. An alkaloid constituting the active principle of the Calabar bean.
n. It is a powerful depressant and nerve-poison: used to counteract strychnine and atropin, also to contract the pupil. Its formula is C15H21O2N3. Also called eserine.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. used in treatment of Alzheimer's disease and glaucoma
Word Usage
"He would see what happens to vervet monkeys every single month at Aberdeen Proving Ground in Maryland: in a crude simulation of a nerve agent attack, the monkeys are given a massive overdose of a drug called physostigmine."