1Each of a set of small swivelling wheels fixed to the legs or base of a heavy piece of furniture so that it can be moved easily.
- The chair has four legs, pedestal or swivel base with castors.
- The cleaner can be used on all coverings, from shagpile carpets to wooden floorboards and ceramic tiles, and is fitted with a soft tread on the castors and wheels to protect even the most sensitive floor coverings.
- The base is available with castors for hard or soft floors.
Definition of castor in:
- US English dictionary