Castor oil

1.

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. Castor-oil plant Same as Palma Christi.

Noun

1.

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

aperient, cathartic, physic, purgative, ricinoleic acid