(UK) An industrial heating device, e.g. for smelting metal or baking ceramics. / (US, Canada) A device that provides heat for a building; a space heater. / (colloquial) Any area that is excessively hot.

To heat in a furnace. / To exhale like a furnace.

plural of furnace

(in combinations) having a particular type or number of furnaces

simple past tense and past participle of furnace

A person employed to operate a furnace.

plural of furnacer

present participle of furnace

(metallurgy) forge in which ore is smelted to metal, the process being intensified by a blast of hot air. / (metallurgy) as above, but specifically a forge where the fuel and the ore are intermixed.

A form of forge, used in smelting and refining, in which the material is melted by radiant heat and convection of hot gases, as opposed to direct contact with the fuel or flame (conduction).