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oleic acid

noun, Chemistry.
a colorless, odorless, liquid, water-insoluble, unsaturated acid, C 1 8 H 3 4 O 2 , obtained from animal tallow and natural vegetable oils, in which it occurs as the glycerol ester: used chiefly in the manufacture of soap, commercial oleates, and cosmetics.
Origin of oleic acid
First recorded in 1810-20 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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Examples from the Web for oleic acid
Historical Examples
  • This was further purified by forming the Boreum salt of oleic acid.

  • Care must be exercised not to heat too highly or the oleic acid will decompose.

    Soap-Making Manual E. G. Thomssen
  • A variety of oleic acid discovered in saponified castor oil.

  • Besides these the fatty acids, stearic, red oil (oleic acid) are more or less extensively used.

    Soap-Making Manual E. G. Thomssen
  • Red oil (oleic acid, elaine) and stearic acid are the two fatty acids most generally bought for soap making.

    Soap-Making Manual E. G. Thomssen
  • The oleic acid, being liquid at ordinary temperature, together with some stearic and palmitic acid, is thus pressed out.

    Soap-Making Manual E. G. Thomssen
  • The quality of stearic acid is best judged by the melting point, since the presence of any oleic acid lowers this.

    Soap-Making Manual E. G. Thomssen
  • Olein, a combination of oleic acid and glycerine, as well as oleic acid itself largely forms the liquid portion of oils and fats.

    Soap-Making Manual E. G. Thomssen
  • This is made by the action of concentrated sulfuric acid upon a solution of oleic acid or stearic acid in an aromatic hydrocarbon.

    Soap-Making Manual E. G. Thomssen
  • The stearic acid thus obtained should be free from oleic acid.

British Dictionary definitions for oleic acid

oleic acid

a colourless oily liquid unsaturated acid occurring, as the glyceride, in almost all natural fats used in making soaps, ointments, cosmetics, and lubricating oils. Formula: CH3(CH2)7CH:CH(CH2)7COOH Systematic name cis-9-octadecenoic acid
Word Origin
C19 oleic, from Latin oleum oil + -ic
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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oleic acid in Medicine

oleic acid o·le·ic acid (ō-lē'ĭk)
An organic acid that is prepared from fats and is used in the preparation of oleates and lotions.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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oleic acid in Science
oleic acid
An oily liquid occurring in animal and vegetable oils and used in making soap. Chemical formula: C18H34O2.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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