(1):

(n.) A small wheel on a swivel, on which furniture is supported and moved.

(2):

(n.) One who casts; as, caster of stones, etc.; a caster of cannon; a caster of accounts.

(3):

(n.) A stand to hold a set of cruets.

(4):

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