Unknown, according to AHD.
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.
pipe that carries gaseous combustion products away from their origin
opening between the lower lip and the languet
Declension of flue