double boiler

noun
🔊/ˌdʌbl ˈbɔɪlə(r)/
🔊/ˌdʌbl ˈbɔɪlər/
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  1. a cooking pot consisting of two pans, one inside the other. The upper pan is heated by boiling water in the lower pan.
    • Melt the chocolate in a double boiler.用双层蒸锅把巧克力化开。