Definition of caster sugar in English:

caster sugar

Line breaks: cast¦er sugar

Entry from British & World English dictionary

(also castor sugar)

noun

[mass noun] British
Finely granulated white or pale golden sugar.

Origin

mid 19th century: so named because it was suitable for use in a castor (see castor1 (sense 2)).

Definition of caster sugar in:

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Pronunciation: nēˈätn-ē
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retention of juvenile features in the adult animal