CASTOR

n. (also caster) 1 a small swivelled wheel (often one of a set) fixed to a leg (or the underside) of a piece of furniture. 2 a small container with holes in the top for sprinkling the contents. øcastor action swivelling of vehicle wheels to ensure stability. castor sugar finely granulated white sugar. [orig. a var. of CASTER (in the general sense)]