From Middle English flue, flewe (“mouthpiece of a hunting horn”), of uncertain origin. Perhaps a back-formation from Middle English *flews (mistaken as a plural), from Old English flēwsa (“a flow, flowing, flux”). Alternatively, perhaps an alteration of Middle English floute, fleute, flote (“a pipe”), see English flute. Compare also Middle Dutch vloegh (“groove, channel, flute of a fluted column”).
flue (plural flues)
- A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace).
- An enclosed passageway in which to direct air or other gaseous current along.
- (obsolete, countable and uncountable) A woolly or downy substance; down, nap; a piece of this.
- In an organ flue pipe, the opening between the lower lip and the languet.
- Alternative form of
- (insect) a fly
- flue på veggen - fly on the wall
- fluge (Nynorsk)
- “flue” in The Bokmål Dictionary.