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.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). castor oil. Retrieved September 27, 2026, from http://smartdefine.org/castor_oil/definitions/1985173 |
| Chicago | Webster's. 2011. "castor oil" http://smartdefine.org/castor_oil/definitions/1985173 (accessed September 27, 2026). |
| Harvard | Webster's 2011, castor oil, Smart Define, viewed 27 September, 2026, <http://smartdefine.org/castor_oil/definitions/1985173>. |
| MLA | Webster's. "castor oil" 27 May 2011. Web. 27 September 2026. <http://smartdefine.org/castor_oil/definitions/1985173> |