Definition

1. Noun:
   • A small wheel or set of wheels attached to the bottom of furniture or equipment to make it easy to move: A caster is a pivoting roller that allows objects to be rolled smoothly across a floor.
   • A small container with a perforated top for sprinkling a powdered substance: A caster is a shaker, often used at the table for sprinkling sugar, salt, or other granular items.
   • A worker who casts metal: A caster is a person whose job is to pour molten metal into molds to create finished products.

Usage and Examples

• Noun (Wheel):

  • The office chair has smooth-rolling casters.
  • We added casters to the heavy cabinet so we could move it easily.

• Noun (Shaker):

  • She picked up the sugar caster to dust the cake.
  • The set included a pepper mill and a salt caster.

• Noun (Worker):

  • The foundry employed several skilled casters.
  • He worked as a caster in a bronze sculpture studio.

Advanced Usage

• "Caster action" or "swivel caster": Refers to a caster wheel that can rotate 360 degrees, providing omnidirectional movement.

  • The hospital bed is equipped with dual-wheel swivel casters for maximum maneuverability.

• "Fixed caster": A caster that does not swivel, only rolls forward and backward.

  • The front wheels of a shopping cart are often fixed casters.

Variants and Related Words

• Castor: A common alternative spelling, especially for the wheel and the shaker. The meanings are identical.

  • Note: In some contexts, "castor" is the preferred spelling (e.g., castor sugar, castor oil).

• Caster Sugar: (British English) A very finely granulated white sugar, named because it was originally sprinkled from a caster.

  • The recipe calls for caster sugar, which dissolves more quickly.

Synonyms

• For the wheel: Wheel, roller, swivel.
• For the shaker: Shaker, dredger, sprinkler.
• For the worker: Foundry worker, molder.

Related Phrases and Compounds

• Caster wheel: The complete assembly including the wheel and its mounting fork.

  • Replace the broken caster wheel on the luggage cart.

• Heavy-duty caster: A caster designed to support very high weights.

  • The industrial shelving unit uses heavy-duty casters.

Notes on Different Meanings

• The meanings of caster (wheel/shaker) and caster (metal worker) are homographs—they are spelled the same but have different etymological origins. The context makes the intended meaning clear.
• The spelling castor is frequently used interchangeably, particularly in British English. However, "castor" is the exclusive spelling for "castor oil" (a vegetable oil).

Noun

1. a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
2. a shaker with a perforated top for sprinkling powdered sugar
3. a worker who casts molten metal into finished products