furnace

Short definition from Wiktionary

Noun

1. 1
   An industrial heating device, such as for smelting metal or firing ceramics.
2. 2
   A device that provides heat for a building.
3. 3
   Any area that is excessively hot.
4. 4
   A place or time of punishment, affliction, or great trial; severe experience or discipline.

Verb

1. 1
   To heat in a furnace.
2. 2
   To exhale like a furnace.

Proper noun

1. 1
   A surname, variant of Furness.