castor1

 
Pronunciation: /ˈkɑːstə/
(also caster)

noun

  • 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.
  • 2a small container with holes in the top, especially one used for sprinkling sugar or pepper.

Origin:

late 17th century (in castor1 (sense 2)): originally a variant of caster, in the general sense 'something that casts'