double boiler
US /ˌdʌb.əl ˈbɔɪ.lər/
UK /ˌdʌb.əl ˈbɔɪ.lər/

1.
banho-maria, panela de banho-maria
a saucepan with an upper pan that fits into a lower pan containing boiling or simmering water, used for cooking delicate sauces, melting chocolate, etc., without scorching
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Melt the chocolate in a double boiler to prevent burning.
Derreta o chocolate em uma panela de banho-maria para evitar que queime.
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She prepared the delicate custard using a double boiler.
Ela preparou o delicado creme usando uma panela de banho-maria.