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Firebox

noun, slang

Noun

1
The chamber of a steam engine, or a steam locomotive, in which the fuel is burned.
"The firebox married to Britannia's boiler is not, however, in the Doncaster tradition, notwithstanding that it is comparable in dimensions to that of the "V2." […] Britannia's firebox would appear to have derived from those of the Bulleid Pacifics, which it closely resembles."
2
a furnace (as on a steam locomotive) in which fuel is burned wordnet
3
The part of a fireplace where the fuel is burned.
4
A redheaded woman or her red pubic hair. slang, vulgar

From fire + box. In the sense of a redheaded woman, from box (“vagina”).

Unscramble this word: firebox