royal icingBrE /ˌrɔɪəl ˈaɪsɪŋ/ 🔊NAmE /ˌrɔɪəl ˈaɪsɪŋ/ 🔊 noun [uncountable] (BrE) a hard white covering for a fruit cake, made with sugar and the white part of eggs (水果蛋糕的)蛋白糖霜硬皮