confectioners' sugar
US /kənˈfek.ʃən.ərz ˌʃʊɡ.ər/
UK /kənˈfek.ʃən.ərz ˌʃʊɡ.ər/

1.
zucchero a velo, zucchero impalpabile
finely powdered sugar, used for icing and decorating cakes and pastries
:
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Dust the brownies with confectioners' sugar before serving.
Spolvera i brownies con lo zucchero a velo prima di servire.
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The recipe calls for two cups of confectioners' sugar for the frosting.
La ricetta richiede due tazze di zucchero a velo per la glassa.