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 research determined that across all countries including Vietnam and Bangladesh, electrification with steam-generating heat pumps leads to greater efficiency gains and energy savings than converting to electric steam or hot oil boilers. —Amy Nguyen, Forbes.com, 24 Apr. 2025

Dozens of rank-and-file union members – pipefitters, boiler makers, painters, iron workers and others – took the mic after Dunn to urge lawmakers to spike SB 222. —Calmatters, Oc Register, 16 Apr. 2025

There’s also evidence that the ship’s engineers left the boilers on, shoveling coal into the furnaces to keep electricity running. —Theresa Braine, New York Daily News, 14 Apr. 2025

Magellan's images indicate the Titanic's crew kept the boilers going as the ship was sinking, the BBC says. —George Petras, USA Today, 11 Apr. 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