Definition of castor noun from the Oxford Advanced Learner's Dictionary



(British English) (North American English caster) noun
BrE BrE//ˈkɑːstə(r)//
; NAmE NAmE//ˈkæstər//
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one of the small wheels fixed to the bottom of a piece of furniture so that it can be moved easily Word Originlate 17th cent. relating to a small container with holes in the top used for sprinkling: originally a variant of caster, in the general sense ‘something that casts’.