Flue
Webster's Dictionary [1]
(1): ( n.) An inclosed passage way for establishing and directing a current of air, gases, etc.; an air passage
(2): ( n.) A passage way for conducting a current of fresh, foul, or heated air from one place to another.
(3): ( n.) In an organ flue pipe, the opening between the lower lip and the languet.
(4): ( n.) 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.
(5): ( n.) Light down, such as rises from cotton, fur, etc.; very fine lint or hair.
(6): ( n.) A compartment or division of a chimney for conveying flame and smoke to the outer air.
King James Dictionary [2]
Flue, n. probably contracted from flume, L. flumen, from fluo.
A passage for smoke in a chimney, leading from the fireplace to the top of the chinmey, or into another passage as a chinmey with four flues.