Source : Webster's Revised Unabridged Dictionary (1913)

Caster \Cast"er\, n.
   1. One who casts; as, caster of stones, etc.; a caster of
      cannon; a caster of accounts.

   2. A vial, cruet, or other small vessel, used to contain
      condiments at the table; as, a set of casters.

   3. A stand to hold a set of cruets.

   4. A small wheel on a swivel, on which furniture is supported
      and moved.

Source : WordNet®

caster
     n 1: a worker who casts molten metal into finished products
     2: a shaker with a perforated top for sprinkling powdered sugar
        [syn: {castor}]
     3: a pivoting roller attached to the bottom of furniture or
        trucks or portable machines to make them movable [syn: {castor}]