Definition of furnaces:
(n) :
(US, Canada) A device that provides heat for a building.
(n) :
An industrial heating device, such as for smelting metal or firing ceramics.
(n) :
(colloquial, figurative) Any area that is excessively hot.
(n) :
(figurative) A place or time of punishment, affliction, or great trial; severe experience or discipline.
(v) :
To heat in a furnace.
(v) :
To exhale like a furnace.