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castor oil Syllabification: cas·tor oil
Pronunciation: /ˈˌkastər ˈˌoil/

Definition of castor oil in English:


A pale yellow oil obtained from castor beans, used as a purgative and a lubricant and in manufacturing oil-based products.
Example sentences
  • Mild oily purgatives like castor oil or bulk laxatives such as linseed or psyllium seeds are recommended.
  • Civil War surgeons began treatment with mild purgatives, such as castor oil, extract of senna, or small doses of calomel.
  • The products include cashew, castor oil, palm, potato, soybean, green bean, peanut, maize, sweet corn and eucalyptus.


Mid 18th century: perhaps so named because it succeeded castor2 in medicinal use.

Definition of castor oil in:
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