Definition of "caster"

caster

/ˈkɑːstə(ɹ)/

noun
plural casters
1. Someone or something that casts.
  Quotations
  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).
3. A shaker with a perforated top for sprinkling condiments such as sugar, salt, pepper, etc.
  Quotations
  Your waiter having settled that point, returns to array your tablecloth, with a table napkin folded cocked-hat-wise (slowly, for something out of window engages his eye), a white wine-glass, a green wine-glass, a blue finger-glass, a tumbler, and a powerful field battery of fourteen casters with nothing in them; […]
  1860 January 28 – October 13, Charles Dickens, chapter VI, in The Uncommercial Traveller, London: Chapman and Hall, […], published 1861
  She could keep cool and collected while she collected your check, give you the correct change, win your heart, indicate the toothpick stand, and rate you to a quarter of a cent better than Bradstreet could to a thousand in less time than it takes to pepper an egg with one of Hinkle’s casters.
  1910, O. Henry [pseudonym; William Sydney Porter], “The Girl and the Habit”, in Strictly Business‎
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.
  Quotations
  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
third-person singular simple present casters, present participle castering, simple past and past participle castered
1. To act as a caster