the box or chamber containing the fire of a steam boiler, furnace, etc.
the furnace of a locomotive, where coal, oil, or other fuel is burned to generate steam.
a box or panel with a device for notifying the fire station of an outbreak of fire.
Obsolete. a tinderbox.

1545–55; fire + box1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
firebox (ˈfaɪəˌbɒks)
1.  the furnace chamber of a boiler in a steam locomotive
2.  an obsolete word for tinderbox

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
The rusted steel firebox and back panel add an industrial-chic edge to the
Also, raising the fuel has the effect of reducing the height of the firebox,
  the area of the fireplace where burning takes place.
Cut off the fire's air supply by closing any intake vents in the firebox.
Washout plugs shall be removed for access and visual inspection of the water
  side of the firebox sheets.
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