flue

noun

ˈflü 

: an enclosed passageway for directing a current: such as

a

: a channel in a chimney for conveying flame and smoke to the outer air

b

: a pipe for conveying flame and hot gases around or through water in a steam boiler

c

: an air channel leading to the lip of a wind instrument

d

: flue pipe

Examples of flue in a Sentence

Recent Examples on the Web

Near-total capture cheaply To operate the system, flue gas from coal, natural gas, or biomass combustion is cooled and compressed before being fed into an absorption column. —Neetika Walter, Interesting Engineering, 14 Nov. 2025

Close the chimney flue to prevent drafts, moisture, or curious critters from sneaking in. —Jalen Williams, Freep.com, 12 Nov. 2025

If the fireplace is never used, plug and seal the chimney flue. —Marina Johnson, Louisville Courier Journal, 29 Oct. 2025

An inspection also calls attention safety issues that require repairs, like cracks, a deteriorating liner, or problems with the flue or chimney cap. —Brandee Gruener, Southern Living, 20 Oct. 2025

Word History

Etymology

origin unknown

First Known Use

1582, in the meaning defined above

Phrases Containing flue

• flue-cured
• flue pipe
• flue stop

Kids Definition

flue

noun

ˈflü 

: an enclosed passageway for directing a current

especially : a channel in a chimney for carrying flame and smoke to the outer air