castor¹ or caster /käˈstər/

1. A small swivelling wheel attached to furniture and trolleys with its hub displaced away from the swivel axis, so that movement in any direction causes the wheel to follow this axis
2. A vessel with perforated top for sprinkling sugar, etc

castor action or caster action noun (motoring)

The use of inclined swivel axes or kingpins to give the steerable front wheels a self-centring tendency after angular deflection

castor sugar or caster sugar noun

White granulated sugar crushed to form fine grains

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