| Date: | 1700-1800 |
| Origin: | Probably from castor 'substance obtained from part of a beaver's body, used in medicines and perfumes' (16-19 centuries), from castor 'beaver' (14-19 centuries), from Latin, from Greek kastor; because castor oil was once used instead of castor in medicines |
MD a thick oil made from the seeds of a plant and used in the past as a medicine to make the bowels empty

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