Firebox (noun)

1. A metal chamber in a steam engine, furnace, or boiler where fuel is burned to produce heat, which is then used to generate steam or to heat water.
2. A metal container in a fireplace where fuel is burned to produce heat.

Origin:

The word 'firebox' is a compound of two words 'fire' and 'box' and refers to a container in which fuel is burned to produce heat or steam.

Examples:

1. The firebox in the steam engine was lined with firebrick, to protect the metal from the high temperatures.
2. The firebox in the furnace was filled with coal, which would burn for several hours and provide heat for the entire building.
3. The engineer monitored the temperature in the firebox, making adjustments as necessary to ensure that the engine ran smoothly.
4. The blacksmith opened the firebox of his forge, adding more coal to the fire and increasing the heat for his work.
5. The firebox in the fireplace was surrounded by a metal grate, which held the burning logs in place and allowed for the proper flow of air.