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flue (n.)

"smoke channel in a chimney," 1580s, of uncertain origin, perhaps related to Middle English flue, flewe "mouthpiece of a hunting horn" (early 15c.), which is perhaps from Old French fluie "stream;" or the modern word is perhaps from Middle Dutch vluwe, from Germanic *flowan "to flow" (see flow (v.)). Originally a small chimney in a furnace connected to the main chimney.

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Definitions of flue from WordNet

flue (n.)
flat bladelike projection on the arm of an anchor;
Synonyms: fluke
flue (n.)
organ pipe whose tone is produced by air passing across the sharp edge of a fissure or lip;
Synonyms: flue pipe / labial pipe
flue (n.)
a conduit to carry off smoke;
From wordnet.princeton.edu