/ Dictionary / Index F flue: Meaning and Definition of Find definitions for: flue Pronunciation: (fl), [key] — n. a passage or duct for smoke in a chimney. any duct or passage for air, gas, or the like. a tube, esp. a large one, in a fire-tube boiler. Seeflue pipe. Also calledwindway.a narrow slit in the upper end of an organ pipe through which the air current is directed. flue Pronunciation: (fl), [key] — n. downy matter; fluff. flue Pronunciation: (fl), [key] — n. a fishing net. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: flue (Thesaurus) flucytosine flue-cure 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