Definition of Caster sugar

Babylon English Dictionary
finely ground sugar (often used in gourmet recipes because of its light texture)
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Caster sugar Definition from Language, Idioms & Slang Dictionaries & Glossaries
Australian Slang
regular sugar (actually slightly finer than regular US sugar, but not much)
WordNet 2.0

Noun
1. very finely granulated sugar that was formerly sprinkled from a castor
(synonym) castor sugar
(hypernym) powdered sugar
(classification) United Kingdom, UK, Great Britain, GB, Britain, United Kingdom of Great Britain and Northern Ireland