double boiler

ˈdou•ble ˈboil•er, n. [countable]

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 in the upper.

dou′ble boil′er,

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.

Collins Concise English Dictionary © HarperCollins Publishers::

double boiler n

US Canadian 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 panAlso called (in Britain and certain other countries): double saucepan

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