royal icing

noun
🔊/ˌrɔɪəl ˈaɪsɪŋ/
🔊/ˌrɔɪəl ˈaɪsɪŋ/
[uncountable] (British English)
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  1. a hard white layer that covers a fruit cake, made with sugar and the white part of eggs(水果蛋糕的)蛋白糖霜硬皮