the GNU version of the Collaborative International Dictionary of English
n. An alkaloid found in the Calabar bean, and the seed of Physostigma venenosum; physostigmine. It is used in ophthalmic surgery for its effect in contracting the pupil.
The Century Dictionary and Cyclopedia
n. An alkaloid obtained from the Calabar bean, Physostigma venenosum, assumed by some authorities to be identical with physostigmine.
Word Usage
"Today, when we know that oculomotor stimulation releases AC. Ch., the action of eserine is revealed as being simply to increase the effect of the Ac.Ch. by inhibiting that of the esterase, and Anderson's results become absolutely clear."