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


caster sugar

BrE BrE//ˌkɑːstə ˈʃʊɡə(r)//
; NAmE NAmE//ˌkæstər ˈʃʊɡər//
(also castor sugar) [uncountable] (British English)
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white sugar in the form of very fine grains, used in cooking Word Originmid 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.