icingPronunciation: /ˈʌɪsɪŋ/Translate icing | into French | into German | into Italian | into Spanish Definition of icing 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 cakeicing in other Oxford dictionaries Definition of icing in the US English dictionary