柯林斯詞典castor oil 1. N-UNCOUNT Castor oil is a thick, yellow oil that is obtained from the seeds of the castor oil plant. It has a very unpleasant taste and in former times was used as a medicine. 蓖麻油 返回 castor oil劍橋詞典a thick usually yellow oil , used especially as a medicine to help people pass the solid waste in their bowels out of the body 蓖麻油（尤用作通便劑） 返回 castor oil