castor oil Meaning, Definition & Usage

  1. noun a purgative extracted from the seed of the castor-oil plant; used in paint and varnish as well as medically

WordNet

Cas"tor oil
Definitions
  1. A mild cathartic oil, expressed or extracted from the seeds of the Ricinus communis, or Palma Christi. When fresh the oil is inodorus and insipid.

Webster 1913