caster

Etymology

cast + -er; the wheel sense comes from obsolete cast (“to turn”).

noun

1. Someone or something that casts.
   a caster of spells
   a caster of stones
   a caster of bronze statuary
   an online caster of video games
   She’s never seen a hired man without Anna to command him. He’s eerie as a shadow without its caster. 2016, C Pam Zhang, How Much of These Hills Is Gold, Virago, page 231
2. A wheeled assembly attached to a larger object at its base to facilitate rolling. A caster usually consists of a wheel (which may be plastic, a hard elastomer, or metal), an axle, a mounting provision (usually a stem, flange, or plate), and sometimes a swivel (which allows the caster to rotate for steering).
   Many office chairs roll on a set of casters.
3. A shaker with a perforated top for sprinkling condiments such as sugar, salt, pepper, etc.
   a set of casters
4. A stand to hold a set of shakers or cruets.
5. (automotive) The angle of the axis around which a car's front wheels rotate when the steering wheel is turned, with a vertical axis being defined as zero caster.
   In addition, caster helps to reduce steering effort and to return the steering wheel to the center position after a turn. 2008, Ronald G Haefner, The Car Care Book, page 238

verb

1. To act as a caster