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

Meanwhile, with more demand for furnaces and boilers, the CFD issued a reminder that residents must have working carbon monoxide detectors. —Adam Harrington, CBS News, 19 Jan. 2026

Emergency services have cleared the site, staff have returned to work, and the studio remains operational following the early-morning boiler malfunction. —Aamir Khollam, Interesting Engineering, 19 Jan. 2026

Infrastructural upgrades include new electrical and plumbing, generator and dual boilers. —David Caraccio, Sacbee.com, 12 Jan. 2026

Other improvements will include roof replacements, new windows and doors, security cameras and upgraded boilers. —Brian J. Rogal, Chicago Tribune, 12 Jan. 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