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Definition of firebox

firebox

/ˈfaɪəɹˌbɑːks/
fire · box

Plural:fireboxes
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firebox Lexical Profile

firebox Game Scores & Validity

• noun

1

The enclosed interior section of a fireplace or wood stove where the fire is physically contained.

Example

"We need to clean the accumulated ash out of the firebox before starting a new fire this evening."


2

The chamber or compartment in a steam locomotive, boiler, or furnace where fuel is burned to produce heat.

Example

"The engineer shoveled coal into the glowing firebox to build up enough steam for the steep climb over the mountains."


3

American A small, brightly colored wall-mounted box containing a mechanical alarm switch that can be pulled to summon the fire department in an emergency.

Example

"During the fire drill, the teacher explained that the firebox in the hallway should only be pulled in a real emergency."

Synonyms
View all synonyms for firebox

Word Origin & Etymology

Originated in the early 19th century as a compound of 'fire' and 'box', primarily coined to describe the combustion chamber of a steam locomotive or boiler.

Usage Trend

Historical frequency of usage in published text.

180019102020

Cite this Entry


Wordmom. (2026). Definition of Firebox. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/firebox
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