- A sugary coating for cakes and other baked goods.
#*1914: Eleanor H. Porter, Pollyanna Grows Up 1
#*:...anyhow, even the cake didn't keep very well. I tried it, and it dried up, 'specially the frosting. I reckon the time to take frosting and good times is while they are going; so I want to see all I can now while I'm here.
- A layer of frost.
The plural form is used for multiple varieties of frosting; a single type of frosting is itself uncountable.
- Present participle of to frost.