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ультрамелкий сахар stresses
food.ind.	ultrafine sugar (Alexander Oshis); superfine sugar (Alexander Oshis); bar sugar (то же, что "superfine sugar' и 'ultrafine sugar" Alexander Oshis)
groc., brit.	caster sugar (As opposed to "confectioners sugar' or 'icing sugar" which is кондитерская пудра proper Alexander Oshis); castor sugar (As opposed to "confectioners sugar' or 'icing sugar" which is кондитерская пудра proper Alexander Oshis)