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cas'tor oil'

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.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

castoreumcastor-oil plant
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