Definition of "buttercream"

buttercream

noun
countable and uncountable, plural buttercreams
1. (cooking) A type of thick, sweet icing or cake-filling made by creaming butter (or sometimes another fat, such as margarine) with powdered sugar.
  Quotations
  He was the first one to use gelatin in his buttercreams, and to make such extensive use of the freezer.
  2009 January 9, Basil Katz, “Gaston Lenôtre, Who Built a Culinary Brand, Is Dead at 88”, in New York Times‎