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

The technologies to electrify process heat that rarely exceeds 250 degrees Celsius, or 482 degrees Fahrenheit, such as heat pumps and electrical boilers, already exist. —Jasmin Malik Chua, Sourcing Journal, 25 Sep. 2025

City officials said the first phase will include replacing the pool decks, plumbing, boilers and gutter system for all three pools. —Grace Hase, Mercury News, 17 Sep. 2025

During a random search of the area, two officers accidentally stumble on a member of the gang posing as a municipal worker in a high-viz boiler suit. —Damon Wise, Deadline, 5 Sep. 2025

Both deliver hot water thanks to an onboard water boiler fed by the 53-L fresh water tank. —New Atlas, 29 Aug. 2025

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