/ Dictionary / Index P physostomous: Meaning and Definition of Find definitions for: phy•sos•to•mous Pronunciation: (fī-sos'tu-mus), [key] — adj. Ichthyol. having the mouth and air bladder connected by an air duct. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. physostigmine phytate 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