Definition of “castor oil” - English Dictionary

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“castor oil” in British English

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castor oilnoun [ U ]

uk /ˌkɑː.stər ˈɔɪl/ us /ˌkæs.tɚ ˈɔɪl/

a thick usually yellow oil, used especially as a medicine to help people pass the solid waste in their bowels out of the body

(Definition of “castor oil” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)