Английский разговорный словарь (основной) - castor oil

ˈkɑ:stərˈɔɪl n. 1 an oil from the seeds of a plant, Ricinus communis, used as a purgative and lubricant. 2 (in full castor oil plant) this plant. øcastor oil bean (or castor bean) a seed of the castor oil plant. [18th c.: orig. uncert.: perh. so called as having succeeded CASTOR(2) in the medical sense]