American Heritage Dictionary
(3)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
(3)
Elsewhere on the web
One aspect of writing such applications is knowing Facebook Markup Language, which has been described as the icing on the Facebook API cake.— Slashdot: Book Reviews
So I've avoided this usual cupcake topping; instead I've used a much easier icing, which is just powdered or icing sugar mixed with lemon juice.— Just Hungry - Japanese recipes, healthy and fun eating, the expat food life and more.
They don't need it because localism is the cake, and globalism is the icing which is expendable.— Foreign Policy In Focus
Twice we went through de-icing, then were told that there was a potential problem with the flight crew being close to the point when it couldn't fly without resting.— The Green Bay Press-Gazette Latest Headlines
Their cupcakes are feather-light (not the dense sort @ Crumb's) and the icing is a thin layer of sweet vanilla cream (not the sickening stick-of-butter per cupcake icing - at least it tastes as such - @ Buttercup or Magnolia).— Felicia C. Sullivan

Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a month.
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