double boiler

n.
A cooking utensil consisting of two nested pans, designed to allow slow, even cooking or heating of food in the upper pan by the action of water boiling in the lower.

A double-pan arrangement whereby two pots are formed to fit together, with one sitting partway inside the other. A single lid fits both pans. The lower pot is used to hold simmering water, which gently heats the mixture in the upper pot. Double boilers are used to warm or cook heat-sensitive food such as custards, delicate sauces and chocolate.

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The noun has one meaning:

Meaning #1: two saucepans, one fitting inside the other
  Synonym: double saucepan

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Double Boiler Stainless Steel Camp Cookware