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castor oil

noun
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 ricinus oil.
Origin of castor oil
1740-1750
1740-50; castor (perhaps variant spelling of caster) + oil; perhaps so called because of its purgative effect
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for castor oil

castor oil

noun
1.
a colourless or yellow glutinous oil obtained from the seeds of the castor-oil plant and used as a fine lubricant and as a cathartic
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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castor oil in Medicine

castor oil cas·tor oil (kās'tər)
n.
A colorless or pale yellowish oil extracted from the seeds of the castor-oil plant, used pharmaceutically as a laxative and skin softener and industrially as a lubricant.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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8
9
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