Etymology
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icing (n.)

1769 in the confectionery sense, "coating of concreted sugar," verbal noun of ice (v.). Earlier in this sense was simple ice (1723); frosting came later. Meaning "process of becoming covered with ice" is from 1881.

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Definitions of icing

icing (n.)
the formation of frost or ice on a surface;
Synonyms: frost
icing (n.)
a flavored sugar topping used to coat and decorate cakes;
Synonyms: frosting / ice
icing (n.)
(ice hockey) the act of shooting the puck from within your own defensive area the length of the rink beyond the opponent's goal;
Synonyms: icing the puck
From wordnet.princeton.edu