/ Dictionary / Index N nitrofurantoin: Meaning and Definition of Find definitions for: ni•tro•fur•an•to•in Pronunciation: (nī"trō-fyoo-ran'tō-in), [key] — n. Pharm. an antimicrobial substance, CHNO, used for the treatment of urinary tract infections. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nitrofurantoin (Thesaurus) nitrocotton nitrogelatin Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language