Definition of "castor sugar" [castor sugar]

• Alternative form of caster sugar. (noun)

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• "He was bearing her a small tray on which were clustered a cup of chocolate-coloured patent milk food, one glass of hot water, a second of cold, a ramekin case filled with castor sugar or alternatively salt, a tot glass filled with something horrible resembling reconstituted egg, a tin marked “Epsom Salts” with the “Epsom” crossed out, and a small greasy bottle labelled “Paraffin, Household.”"