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Definition of flue : 1. A compartment or division of a chimney for conveying flame and smoke to the outer air.
2. A passage way for conducting a current of fresh, foul, or heated air from one place to another.
3. A pipe or passage for conveying flame and hot gases through surrounding water in a boiler; - distinguished from a tube which holds water and is surrounded by fire. Small flues are called fire tubes or simply tubes.
4. An inclosed passage way for establishing and directing a current of air, gases, etc.; an air passage
5. In an organ flue pipe, the opening between the lower lip and the languet.
6. Light down, such as rises from cotton, fur, etc.; very fine lint or hair.

Synonyms:

fluke, trematode worm, labial pipe, exhaust, trematode, flue pipe, good luck, good fortune

blowhole, breathing hole, air shaft, air pipe, chimney, windpipe, vent

Usage examples:

• There was no flue for a stove in our part of the house. - "The-Life-of-Me-an-autobiography", Johnson, Clarence Edgar.
• I shall slip down the flue With this letter for you, So softly, for fear I your slumbers might break. - "In The Yule-Log Glow, Vol. IV (of IV)", Harrison S. Morris.
• In the winter, I am persuaded, I could not exist in rooms thus closed up, with stoves heated in their manner, for they only put wood into them twice a day; and, when the stove is thoroughly heated, they shut the flue, not admitting any air to renew its elasticity, even when the rooms are crowded with company. - "Letters written during a short residence in Sweden, Norway, and Denmark", Mary Wollstonecraft.