This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A chamber, such as the furnace of a steam locomotive, in which fuel is burned.

n. A box containing a fire alarm.

n. The chamber of a steam engine, or a steam locomotive, in which the fuel is burned.

n. The part of a fireplace where the fuel is burned.

n. A redheaded woman (by synecdoche, pars pro toto), or her red pubic hair, from box ("vagina").

n. a furnace (as on a steam locomotive) in which fuel is burned

"In general, most fireplaces do not have an operable flue damper to control the flow of smoke out the chimney or to keep the cool air from entering the firebox from the chimney above."

furnace   

red cunt hair   

tolaunch    smokestack    tar-paper    brazier    worldlet