Definitions
1.nounAn industrial heating device, e.g. for smelting metal or baking ceramics.
2.nounA device that provides heat for a building; a space heater.
3.nounAny area that is excessively hot.
4.nounA place or time of punishment, affliction, or great trial; severe experience or discipline.
5.verbTo heat in a furnace.
6.verbTo exhale like a furnace.