flue

/fluห/

IPA: /F L UW1/

noun
  1. 1

    A pipe or duct that carries gaseous combustion products away from the point of combustion (such as a furnace).

  2. 2

    An enclosed passageway in which to direct air or other gaseous current along.

  3. 3

    A woolly or downy substance; down, nap; a piece of this.

  4. 4

    In an organ flue pipe, the opening between the lower lip and the languet.

adjective
  1. 1

    Shallow; flat

Source: https://en.wiktionary.org/wiki/flue