/ Dictionary / Index S sulfadiazine: Meaning and Definition of Find definitions for: sul•fa•di•a•zine Pronunciation: (sul"fu-dī'u-zēn", -zin), [key] — n. Pharm. a sulfanilamide derivative, CHNOS, used chiefly in the treatment of urinary tract infections, meningitis, and malaria. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sulfadiazine (Thesaurus) sulfa sulfa drug Related Content Daily Word Quiz: fidelity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language