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Longman Dictionary of Contemporary English
castor sugar
noun
EXAMPLES FROM CORPUS
▪ Two tomatoes cut in half and sprinkled with a little castor sugar.
Wiktionary
castor sugar

n. (context UK NZ English) Alternative form of '''caster sugar'''.

WordNet
castor sugar

n. very finely granulated sugar that was formerly sprinkled from a castor [syn: caster sugar]