caster sugar

noun

/ˈkɑːstə ʃʊɡə(r)/

/ˈkæstər ʃʊɡər/

(also castor sugar)

[uncountable] (British English)

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white sugar in the form of very fine grains, used in cooking幼砂糖 compare granulated sugar
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.