caster sugar
noun/ˈkɑːstə ʃʊɡə(r)/
/ˈkæstər ʃʊɡər/
(also castor sugar)
[uncountable] (British English)- white sugar in the form of very fine grains, used in cooking compare granulated sugarWord 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.
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caster sugar