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Noun: castor sugar  'kãs-tu(r) 'shû-gu(r)
Usage: Brit
  1. Very finely granulated sugar that was formerly sprinkled from a castor
    "The recipe called for castor sugar to ensure a smooth texture in the meringue";
    - caster sugar [Brit]

Derived forms: castor sugars

Type of: confectioners' sugar, powdered sugar

Encyclopedia: Castor sugar