an enclosed structure in which material can be heated to very high temperatures, e.g. for smelting metals 火炉,熔炉 ■an appliance fired by gas or oil in which air or water is heated to be circulated throughout a building in a heating system (建筑物内的)暖气炉 ■used to describe a very hot place 火炉,极闷热的地方 her car was a furnace. 她的汽车热得像是一个火炉。
语源
Middle English: from Old French fornais(e), from Latin fornax, fornac-, from fornus 'oven'