: 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
Examples of flue in a Sentence
Recent Examples on the Web
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
But the couple didn’t buy for the archaeological finds, which also showed up behind fireplace flues.
—Adriane Quinlan, Curbed, 7 Oct. 2025
The flue gases leaving these facilities contain 3-15% CO2 by volume.
—Tejasri Gururaj, Interesting Engineering, 3 Oct. 2025
Excavators also found the remnants of Roman building materials, including ceramic roofing, painted wall plaster and box flue tiles.
—Andrea Margolis, FOXNews.com, 25 July 2025
See All Example Sentences for flue
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Brandee Gruener, Southern Living, 20 Oct. 2025
But the couple didn’t buy for the archaeological finds, which also showed up behind fireplace flues.
—Adriane Quinlan, Curbed, 7 Oct. 2025
The flue gases leaving these facilities contain 3-15% CO2 by volume.
—Tejasri Gururaj, Interesting Engineering, 3 Oct. 2025
Excavators also found the remnants of Roman building materials, including ceramic roofing, painted wall plaster and box flue tiles.
—Andrea Margolis, FOXNews.com, 25 July 2025
See All Example Sentences for flue
Cite this Entry
“Flue.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flue. Accessed 31 Oct. 2025.
Copy CitationKids Definition
flue
noun
: an enclosed passageway for directing a current
especially
: a channel in a chimney for carrying flame and smoke to the outer air
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