Akademik

very finely granulated sugar that was formerly sprinkled from a castor

castor sugar or caster sugar noun

White granulated sugar crushed to form fine grains

Main Entry: ↑castor

caster sugar UK US noun [uncountable] british

white sugar in the form of very small grains, used especially in cooking

Thesaurus: sweet food and desserts_hyponym types of food or drink_hypernym

ˌcaster ˈsugar (also ˌcastor ˈsugar) noun uncountable (BrE)

white sugar in the form of very fine grains, used in cooking

See also: ↑castor sugar  

[caster sugar] mid 19th cent.: so named because it was suitable for use in a castor, a small container with holes in the top, used for sprinkling sugar.