adjective Nutrition.

of or noting a class of animal or vegetable fats, especially plant oils, whose molecules consist of carbon chains with many double bonds unsaturated by hydrogen atoms and that are associated with a low cholesterol content of the blood.

Origin of polyunsaturated

First recorded in 1930–35; poly- + unsaturated
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for polyunsaturated

Contemporary Examples of polyunsaturated

  • In fact, the correction of the Cambridge study had to do with polyunsaturated fats—not saturated fats.

    The Daily Beast logo
    The AHA’s Absurd Saturated Fat Obsession

    Dr. Barbara H. Roberts

    June 3, 2014

  • The recording was sprinkled with repeated instances of unusual key words, such as “polyunsaturated” and “knuckleduster.”

    The Daily Beast logo
    Will Work for 25 Cents an Hour!

    Thomas E. Weber

    June 22, 2011

British Dictionary definitions for polyunsaturated



of or relating to a class of animal and vegetable fats, the molecules of which consist of long carbon chains with many double bonds. Polyunsaturated compounds are less likely to be converted into cholesterol in the body. They are widely used in margarines and in the manufacture of paints and varnishesSee also monounsaturated
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

Word Origin and History for polyunsaturated

1921, from poly- + unsaturated.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for polyunsaturated




Of or relating to long-chain carbon compounds, especially fatty acids, having two or more double bonds per molecule. Foods containing polyunsaturated fatty acids help reduce the level of LDL cholesterol in the blood.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for polyunsaturated



Relating to an organic compound, especially a fat, in which more than one pair of carbon atoms are joined by double or triple bonds. See more at unsaturated.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.