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castor oil

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

See also: castor oil


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