Castor

/'kɑ:stə/
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Definition
  1. Noun:
    • A type of small wheel: A castor is a small wheel, typically one that can swivel, attached to the bottom of furniture or equipment to make it easy to move.
    • A beaver: Castor is the genus name for beavers, the large, semiaquatic rodents known for building dams and lodges.
    • A container with holes: A castor is a small container, often with a perforated top, used for sprinkling substances like sugar or pepper.
    • A star: Castor is the name of a bright star in the constellation Gemini, traditionally part of a multiple-star system.
Examples

  • Noun (Wheel):

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

  • Noun (Animal):

    • The scientific name for the North American beaver is Castor canadensis.
    • The fur trade once heavily relied on the castor.

  • Noun (Container):

    • She picked up the sugar castor to dust the cake.
    • The table was set with silver salt and pepper castors.

  • Noun (Star):

    • Castor and Pollux are the two brightest stars in the constellation Gemini.
    • Astronomers have discovered that Castor is actually a system of six stars.
Advanced Usage
  • "Castor oil": A thick vegetable oil obtained from the seeds of the castor oil plant (), used historically as a laxative and in various industrial applications.
    • Castor oil was a common home remedy in the past.
Variants and Related Words
  • Caster: An alternative, and often preferred, spelling for the wheel and the shaker/sprinkler meanings. (e.g., , ).
  • Castoreum: A secretion from the castor (beaver) used in perfumery and traditional medicine.
Synonyms
  • For the wheel: Roller, wheel, swivel.
  • For the animal: Beaver.
  • For the container: Shaker, sprinkler, dredger.
  • For the star: Alpha Geminorum (astronomical designation).
Noun
  1. type genus of the Castoridae: beavers
  2. a hat made with the fur of a beaver (or similar material)
  3. a pivoting roller attached to the bottom of furniture or trucks or portable machines to make them movable
  4. a shaker with a perforated top for sprinkling powdered sugar
  5. a multiple star with 6 components; second brightest in Gemini; close to Pollux

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