Etymology
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frosting (n.)

1610s as an action; 1756 as a substance; verbal noun from frost (v.). Specific meaning "cake icing" is by 1832, so called from its appearance.

updated on January 26, 2015

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Definitions of frosting from WordNet

frosting (n.)
a flavored sugar topping used to coat and decorate cakes;
Synonyms: icing / ice
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.