double boiler

noun
a utensil consisting of two pots, one of which fits partway into the other: water is boiled in the lower pot to cook or warm food or melt a substance in the upper.

Origin:
1875–80, Americanism

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
double boiler
 
n
(US), (Canadian) Also called (in Britain and certain other countries): double saucepan a cooking utensil consisting of two saucepans, one fitting inside the other. The bottom saucepan contains water that, while boiling, gently heats food in the upper pan

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Example sentences
Put egg yolks, lemon juice, and mustard in top of a double boiler or in a
  round-bottomed medium bowl and set over simmering water.
Melt wax and chocolate chips together in a double boiler.
Place it in the top of a double boiler over simmering water.
Melt first three ingredients in top of double boiler.
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