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English definition of “castor”

castor

noun [C] uk UK (US caster)   /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 easilyFurniture and fittings - general words
(Definition of castor from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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