/ Dictionary / Index F flucytosine: Meaning and Definition of Find definitions for: flu•cy•to•sine Pronunciation: (fl-sī'tu-sēn"), [key] — n. Pharm. a synthetic whitish crystalline powder, CHFNO, with antifungal activity, used in the treatment of systemic and eye fungal infections caused by susceptible strains of Candida or Cryptococcus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fluctuation flue 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