/ Dictionary / Index P physostigmine: Meaning and Definition of Find definitions for: phy•so•stig•mine Pronunciation: (fī"sō-stig'mēn, -min), [key] — n. Pharm. an alkaloid, CHNO, used in the treatment of Alzheimer's disease to raise the level of the neurotransmitter acetylcholine and also as a miotic in glaucoma. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: physostigmine (Thesaurus) physogastric physostomous Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language