'Castor oil' definitions:
Definition of 'castor oil'
From: WordNet
noun
A purgative extracted from the seed of the castor-oil plant; used in paint and varnish as well as medically
Definition of 'Castor oil'
From: GCIDE
- Castor oil \Cas"tor oil\ (k[a^]s"t[~e]r oil`). A mild cathartic oil, expressed or extracted from the seeds of the Ricinus communis, or Palma Christi. When fresh the oil is inodorous and insipid. [1913 Webster]
- Castor-oil plant. Same as Palma Christi. [1913 Webster]