[noun] [C] - a container which is heated to a very high temperature, so that substances that are put inside it, such as metal, will melt or burn, or (US) a piece of equipment for heating a buildingPeople who work with furnaces in a steel factory need to wear protective clothing.This room's (like) a furnace (= is very hot)!(US) It's cold in here - should I turn on the furnace?
Meaning of FURNACE in English
Cambridge English vocab. Кембриджский английский словарь. 2012