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English Lexicon

Castor

/ˈkæs.tər/
nounCEFR B2 (Upper)Top #8500 frequency
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Comprehensive Definitions & Senses

2 senses
As noun
  1. 1

    A small wheel fixed to the legs or bottom of a heavy piece of furniture or machine to allow it to be moved easily.

    "She attached swivel castors to the bottom of the heavy wooden chest to move it across the room."
  2. 2

    A North American beaver, or a medicinal oil obtained from the seeds of the tropical castor-oil plant.

    "Castor oil has traditionally been used both as a mild laxative and as a lubricant in machinery."
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Thesaurus & Semantic Spectrum

Synonyms (3)
Antonyms & Contrasting Words (1)

Linguistic Origin & Historical Etymology

Derived from the Latin word 'castor', meaning beaver, which comes from the ancient Greek 'kastōr'. The botanical usage for the oil plant derives from confusion with the unrelated chaste tree (vitex), while the mechanical wheel sense emerged via metaphoric extension.

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