noun

• (cooking) A sweet, often creamy and thick glaze made primarily of sugar, often enriched with ingredients like butter, egg whites, or flavorings, typically used for baked goods.
  "THICK FLUFFY ICING At the present time there is a demand for very light fluffy icing that may be piled high on a cake. For beating many of the icings of this variety an electric beater is used, and the syrup is added very slowly."
• (ice hockey) A minor violation of ice hockey rules, occurring when a player shoots the puck from his/her side of the red line so that it crosses the goal line on the opponent's side. A team playing short-handed is not penalized for this.
• (aviation, meteorology) Conditions conducive to the formation of ice on aircraft surfaces.
  "The Cessna pilots reported that moderate icing was present between 13,000 and 4,000 feet in the cloud layers."