double boiler
From Longman Dictionary of Contemporary EnglishRelated topics: Utensilsdouble boilerˌdouble ˈboiler noun [countable] DFUa pot for cooking food, consisting of one pan resting on top of another pan with hot water in itExamples from the Corpusdouble boiler• In the top of a double boiler over hot water, melt the chocolate squares and the tablespoon butter.• Melt chocolate, best done on a double boiler, and add it to the egg white mixture.