boiler

noun

boil·​er ˈbȯi-lər How to pronounce boiler (audio)
1
: one that boils
2
a
: a vessel used for boiling
b
: the part of a steam generator in which water is converted into steam and which consists usually of metal shells and tubes
c
: a tank in which water is heated or hot water is stored
d
chiefly British : furnace

Examples of boiler in a Sentence

Recent Examples on the Web
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.
Similarly, when using the Heat setting, the HVAC system engages the furnace, boiler, or similar heating system at the same time as the fan, increasing the amount of energy used. — Timothy Dale, The Spruce, 24 Aug. 2026 Then, in the early morning hours on this day in 1985, a massive boiler was spotted. — Encyclopedia Britannica, 24 Aug. 2026 Like much of the Railyards, the boiler and erecting shop buildings have long needed attention. — Graham Womack, Sacbee.com, 22 Aug. 2026 Natural gas is deeply embedded upstream in textile manufacturing, supplying captive electricity generation as well as the boilers and steam required for processes including dyeing, washing, drying and finishing. — Alexandra Harrell, Footwear News, 19 Aug. 2026 See All Example Sentences for boiler

Word History

First Known Use

circa 1540, in the meaning defined at sense 1

Time Traveler
The first known use of boiler was circa 1540

Phrases Containing boiler

Rhymes for boiler

See All Rhymes for boiler

Browse Nearby Words

boiled sweets
boiler
boiler compound
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Cite this Entry

“Boiler.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/boiler. Accessed 1 Sep. 2026.

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Kids Definition

boiler

noun
boil·​er ˈbȯi-lər How to pronounce boiler (audio)
1
: a container in which something is boiled
2
: a strong metal container used in making steam
3
: a tank in which water is heated or hot water is stored

More from Merriam-Webster on boiler

Britannica.com: Encyclopedia article about boiler

Last Updated: - Updated example sentences
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