English

Definition of caster sugar noun from the Oxford Advanced Learner's Dictionary

 

caster sugar

 noun
noun
BrE
 
; NAmE
 
(also castor sugar) [uncountable] (British English)
 
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white sugar in the form of very fine grains, used in cooking Word Origin mid 19th cent.: so named because it was suitable for use in a castor, a small container with holes in the top, used for sprinkling sugar.