/ Dictionary / Index P polythiazide: Meaning and Definition of Find definitions for: pol•y•thi•a•zide Pronunciation: (pol"ē-thī'u-zīd"), [key] — n. Pharm. a substance, CHClFNOS, used as a diuretic in the management of edema and hypertension. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polythene polytomy Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language