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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. 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.

Century Dictionary and Cyclopedia

  1. n. The oil yielded by the seeds of Ricinus communis (the castor-oil plant), a native of India, but now distributed over all the warmer regions of the globe. The oil is obtained from the seeds by bruising them between rollers and then pressing them in hempen bags in a strong press. The oil that first comes away, called cold-drawn castor-oil, is reckoned the best; an inferior quality is obtained by heating or steaming the pressed seeds, and again subjecting them to pressure. The oil is afterward heated to the boiling-point, in order to separate the albumen and impurities. Castor-oil is used medicinally as a mild but efficient purgative. It is also used as a fixing agent in cotton-dyeing, especially in dyeing a Turkey-red color from madder. In its saponified state it is sold under various names, as Turkey-red oil, alizarin oil, sulphated oil, soluble oil, etc.

Wiktionary

  1. n. the pale yellow vegetable oil extracted from the castor bean; used as a laxative and an industrial lubricant

GNU Webster's 1913

  1. 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.

WordNet 3.0

  1. n. a purgative extracted from the seed of the castor-oil plant; used in paint and varnish as well as medically

Etymologies

  1. Possibly from a former use as a substitute for castor in medicine. (American Heritage® Dictionary of the English Language, Fourth Edition)

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‘castor oil’ has been looked up 1193 times, added to 5 lists, and is not a valid Scrabble word.