powdered sugar       
noun [ U ] US uk/ˌpaʊ.dəd ˈʃʊɡ.ər/ us/ˌpaʊ.dɚd ˈʃʊɡ.ɚ/ (also confectioners' sugar); (UK icing sugar)
 (制糖衣用的)糖粉
a soft powder made from sugar that is used to make icing for cakes
  The cupcakes were dusted with powdered sugar.
 In a large bowl combine the cream cheese and powdered sugar.
 See also: brown sugarcaster sugardemerara sugargranulatedpalm sugarsuperfine sugar
 - More examples
 - Sift the powdered sugar into a small bowl.
 - Toss the doughnuts in powdered sugar.
 - When cool, cover with a mixture of lemon juice and powdered sugar.