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castor

noun [C] UK (US caster)
 
 
/ˈkɑː.stər/ US  /ˈkæs.tɚ/

Definition

a small wheel, usually one of a set, that is fixed to the bottom of a piece of furniture so that it can be moved easilyFurniture and fittings - general words
(Definition of castor noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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