[castor oil] n [prob. fr. its former use as a substitute for castoreum in medicine] (1746): a pale viscous fatty oil from castor beans used esp. as a cathartic and as a lubricant and plasticizer
CASTOR OIL
Meaning of CASTOR OIL in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012