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Entry 1 sense Webster, 1913

Castor oil

/(kăs"tẽr oil`)/ · Cas·tor oil · IPA /ˈkæ.stɚ ˌɔɪl/
01 A mild cathartic oil, expressed or extracted from the seeds of the Ricinus communis, or Palma Christi. When fresh the oil is inodorous and …
  1. 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.
Phrases & compounds
Castor-oil plant — Same as Palma Christi.