/ Dictionary / Index P prazosin: Meaning and Definition of Find definitions for: pra•zo•sin Pronunciation: (prā'zō-sin), [key] — n. Pharm. a white crystalline substance, CHNO, used in the treatment of hypertension. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: prazosin (Thesaurus) praying mantis PRC Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language