Meaning of castor oil

cas'tor oil'

Pronunciation: [key]
  1. a colorless to pale yellow, viscid liquid, usually obtained from the castor bean by a pressing process: used as a lubricant, in the manufacture of certain soaps and creams, and in medicine chiefly as a cathartic. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.