/ Dictionary / Index S sulfisoxazole: Meaning and Definition of Find definitions for: sul•fi•sox•a•zole Pronunciation: (sul"fi-sok'su-zōl"), [key] — n. Pharm. a white to yellowish, crystalline, slightly bitter sulfonamide, CHNOS, used chiefly in the treatment of infections of the urinary tract. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sulfisoxazole (Thesaurus) sulfinyl group sulfite Related Content Daily Word Quiz: perennial Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language