Definition of flue noun from the Oxford Advanced Learner's Dictionary

 

flue

 noun
noun
BrE BrE//fluː//
 
; NAmE NAmE//fluː//
 
 
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a pipe or tube that takes smoke, gas or hot air away from a fire, a heater or an oven a blocked chimney flue Word Origin late Middle English (denoting the mouthpiece of a hunting horn): of unknown origin. Current senses date from the late 16th cent.
See the Oxford Advanced American Dictionary entry: flue