noun
very finely granulated sugar that was formerly sprinkled from a castor
• Syn: ↑castor sugar
• Regions: ↑United Kingdom, ↑UK, ↑U.K., ↑Britain, ↑United Kingdom of Great Britain and Northern Ireland, ↑Great Britain
• Hypernyms: ↑powdered sugar
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castor sugar or caster sugar noun
White granulated sugar crushed to form fine grains
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Main Entry: ↑castor
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caster sugar UK US noun [uncountable] british
white sugar in the form of very small grains, used especially in cooking
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white sugar in the form of very fine grains, used in cooking
See also: ↑castor sugar
Word Origin:
[caster sugar] 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.
Useful english dictionary. 2012.