Meaning of “castor” in the English Dictionary

british dictionary

"castor" in British English

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castornoun [ C ]

UK US caster uk /ˈkɑː.stər/ us /ˈkæs.tɚ/

a small wheel, usually one of a set, that is attached to the bottom of a piece of furniture so that it can be moved easily

(Definition of “castor” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)