From Longman Dictionary of Contemporary Englishfrostingfrost‧ing /ˈfrɒstɪŋ $ ˈfrɒːstɪŋ/ noun [uncountable] especially American English DFCa sweet substance put on cakes and made from powdery sugar and butter SYN icing British English
Examples from the Corpus
frosting• Her hair is now streaked with expensive frosting courtesy of e Christofe, Beverly Hills stylist to the superstars.• Ice creams and lollies seem to benefit from the sharp wit of its frosting.• This is because slight frosting on the eyes covers up careless blending and matt lipsticks have often been too dry-looking.• Add boiling water and beat to make a smooth frosting.• The frosting will harden as it cools and, as you are spreading it, it will cool more rapidly. 