/ Dictionary / Index F fluorouracil: Meaning and Definition of Find definitions for: fluor•o•u•ra•cil Pronunciation: (floor"u-yoor'u-sil, flôr"-, flōr"-), [key] — n. Pharm. a pyrimidine analog, CHFNO, used in the treatment of certain cancers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fluorouracil (Thesaurus) fluorosis fluorspar Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language