firebox

noun

fire·​box ˈfī(-ə)r-ˌbäks 

1

: a chamber (as of a furnace or steam boiler) that contains a fire

2

: a box containing an apparatus for transmitting an alarm to a fire station

Examples of firebox in a Sentence

Recent Examples on the Web

When using the fireplace, reduce heat loss by opening dampers in the bottom of the firebox (if provided) or open the nearest window slightly – approximately 1 inch – and close doors leading into the room. —Marina Johnson, Louisville Courier Journal, 29 Oct. 2025

Overusing Fieldstone Fieldstone fireplaces were rampant in the 90s and early 2000s, as clients sought to add authenticity to gas fireboxes and new build homes. —Abby Wolner, Better Homes & Gardens, 8 Oct. 2025

The oily, tar-like creosote inside your firebox can be dissolved with an alkaline cleaner. —Brandee Gruener, Southern Living, 5 Oct. 2025

There’s a door on the top of the hopper for adding charcoal, and a firebox door down below. —PC Magazine, 1 July 2025

Word History

First Known Use

1735, in the meaning defined at sense 1

Rhymes for firebox

• aftershocks
• chatterbox
• equinox
• goldilocks
• hollyhocks
• interlocks
• orthodox
• paradox
• tomahawks
• balks
• blocks
• blocs

Kids Definition

firebox

noun

fire·​box -ˌbäks 

1

: a chamber (as of a furnace) that contains a fire

2

: a box containing a fire alarm