castor oil
noun/ˈkɑːstər ɔɪl/
/ˈkæstər ɔɪl/
[uncountable]- a thick yellow oil obtained from a tropical plant and used in the past as a type of medicine, usually as a laxativeWord Originmid 18th cent.: perhaps so named because it succeeded castor (an oily reddish brown substance) in medicinal use.
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castor oil