Definition of caster
1
: one that casts;
especially
: a machine that casts type
2
or
castor
play
\-tər\
a
: a usually silver table vessel with a perforated top for sprinkling a seasoning (such as sugar or spice)
b
: a usually revolving metal stand bearing condiment containers (such as cruets, mustard pot, and often shakers) for table use : a cruet stand
3
: any of a set of wheels or rotating balls mounted in a swivel frame and used for the support and movement of furniture, trucks, and portable equipment
4
: the slight usually backward tilt from vertical of the axis of the steering mechanism of an automobile for giving directional stability to the front wheels
