icing

 
Pronunciation: /ˈʌɪsɪŋ/

noun

[mass noun]
  • 1a mixture of sugar with water, egg white, or butter, used as a coating for cakes or biscuits.
  • 2the formation of ice on an aircraft, ship, or other vehicle, or in an engine.

Phrases

the icing (North American also frosting) on the cake

an attractive but inessential addition or enhancement: more goals would have been the icing on the cake