: 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
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
Make sure the fireplace flue is open before lighting it.
—Nicole Villalpando, Austin American Statesman, 2 July 2025
See All Example Sentences for flue
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
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
Make sure the fireplace flue is open before lighting it.
—Nicole Villalpando, Austin American Statesman, 2 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 14 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share