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Từ điển Oxford Advanced Learner 8th
castor oil
ˌcastor ˈoil BrE NAmE noun uncountable
a thick yellow oil obtained from a tropical plant and used in the past as a type of medicine, usually as a ↑laxative
Word Origin:
[castor oil] mid 18th cent.: perhaps so named because it succeeded castor (an oily reddish brown substance) in medicinal use.
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