castor
noun/ˈkɑːstə(r)/
/ˈkæstər/
(British English) (North American English caster)
- one of the small wheels fixed to the bottom of a piece of furniture so that it can be moved easilyWord 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’.
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castor