boiler

noun

boil·​er ˈbȯi-lər 

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

Despite the installation of a smoke filtration system, preliminary testing found that emissions from its boiler smokestacks exceeded Cambodia’s legal limits. — Jasmin Malik Chua, Footwear News, 17 July 2026

Set in an alternate past during Japan's Meiji era, the world of Sparks of Tomorrow is totally reliant on steam power, with massive boilers constantly puffing away. — K. Thor Jensen, PC Magazine, 3 July 2026

Contreras has always been an overheating boiler of a ballplayer, with a history of arguing with umpires, throwing bats and helmets, and willing to charge the mound over any slight, real or imagined. — Steve Buckley, New York Times, 2 July 2026

During the excavation, archaeologists uncovered stone foundations, teacups, drinking glasses and evidence of the distillery's copper stills and boilers, which helped researchers reconstruct how the massive operation functioned. — Andrea Margolis, FOXNews.com, 30 June 2026

Word History

First Known Use

circa 1540, in the meaning defined at sense 1

Phrases Containing boiler

• boiler room
• double boiler
• steam boiler

Rhymes for boiler

• broiler
• oiler
• spoiler
• toiler
• reboiler

Kids Definition

boiler

noun

boil·​er ˈbȯi-lər 

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