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castor oil
(redirected from Caster oil)

   Also found in: Medical, Wikipedia 0.06 sec.
castor oil, yellowish oil obtained from the seed of the castor bean castor bean, bean produced by Ricinus communis, a plant of the spurge family, widely cultivated as an ornamental. Moles die when they eat the roots. It has long been used as an ordeal poison in parts of Africa.
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. The oil content of the seeds varies from about 20% to 50%. After the hulls are removed the seeds are cold-pressed. Medicinal castor oil is prepared from the yield of the first pressing; this is used as a purgative and laxative. Oil from the second pressing is used as a lubricant for machinery, as a softening agent in making artificial leather, in the dressing of genuine leather, in brake fluids, and in paints and plastic materials. The residue can be used as fertilizer and (after the poisonous substance, ricin, is removed) as cattle feed. Other products having similar properties and uses have been gradually replacing castor oil.
castor oil
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


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Other mainstays of Halsey's practice included giving emetics to induce vomiting, cathartics to trigger bowel movements and dispensing other popular medicines of the day, from snake root and caster oil to quinine, expectorants and various salts.
 
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