/ Dictionary / Index P polydipsia: Meaning and Definition of Find definitions for: pol•y•dip•si•a Pronunciation: (pol"ē-dip'sē-u), [key] — n. Med. excessive thirst. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polydipsia (Thesaurus) Polydeuces polydisperse Related Content Daily Word Quiz: tactful Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language