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 laxative
蓖麻油 词源mid 18th cent.: perhaps so named because it succeeded castor (an oily reddish brown substance) in medicinal use.