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castor sugar

noun, Chiefly British
finely ground or powdered sugar.
Origin of castor sugar
1850-55 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Historical Examples
Contemporary definitions for castor sugar

finely granulated sugar; also called superfine sugar , caster sugar

Word Origin

from the small vessel with a perforated top from which to sprinkle sugar

Usage Note

British cooking's 21st Century Lexicon
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