caster

UK: /ˈkɑːstə^r/ US: /ˈkæstɚ/ ,(kas′tər, kä′stər)

WordReference Random House Learner's Dictionary of American English © 2026

cast•er /ˈkæstɚ/   n. [countable]

1. a person or thing that casts.
2. a small wheel on a swivel, set under a piece of furniture, etc., to make it easier to move.

WordReference Random House Unabridged Dictionary of American English © 2026

cast•er  (kas′tər, kä′stər), n. 

1. a person or thing that casts.
2. a small wheel on a swivel, set under a piece of furniture, a machine, etc., to facilitate moving it.
3. a bottle or cruet for holding a condiment.
4. a stand containing a set of such bottles.
5. a metal container for sugar, pepper, etc., having a perforated top to permit sprinkling;
   dredger;
   muffineer.
6. Automotive the angle that the kingpin makes with the vertical. Automobiles are usually designed with the upper end of the kingpin inclined rearward (positive caster) for improved directional stability.

v.i. 

7. Mechanical Engineering (of a wheel) to swivel freely in a horizontal plane.

Also, castor (for defs. 2–5).

• 1300–50; Middle English; see cast¹, -er¹

cast′er•less, adj. 

Collins Concise English Dictionary © HarperCollins Publishers::

caster / ˈkɑːstə/ noun

1. a person or thing that casts
2. Also: castor a bottle with a perforated top for sprinkling sugar, etc, or a stand containing such bottles
3. Also: castor a small wheel mounted on a swivel so that the wheel tends to turn into its plane of rotation