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[glahy-kuh-juh n, -jen] /ˈglaɪ kə dʒən, -ˌdʒɛn/
noun, Biochemistry
a white, tasteless polysaccharide, (C 6 H 10 O 5) n , molecularly similar to starch, constituting the principal carbohydrate storage material in animals and occurring chiefly in the liver, in muscle, and in fungi and yeasts.
Also called animal starch.
Origin of glycogen
1855-60; glyco- + -gen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for glycogen
Historical Examples
  • His potential energy is the food stored up in his body, particularly the glycogen in the liver and muscles.

    Applied Eugenics Paul Popenoe and Roswell Hill Johnson
  • There is a limit to the ability of the liver to change sugar into glycogen.

    Physiology Ernest G. Martin
  • Fat is a form of stored food which is not so readily available for use as are glycogen and glucose.

    Encyclopedia of Diet Eugene Christian
  • Maltose is absorbed and assimilated, converted into glycogen.

  • It is also thought the glycogen thus deposited and stored up in the liver is little by little changed into sugar.

    A Practical Physiology Albert F. Blaisdell
  • Thus we have animal starch, or glycogen, stored up in the liver.

    A Practical Physiology Albert F. Blaisdell
  • glycogen is also stored in the muscles, where it is oxidized to release energy when the muscles are exercised.

    A Civic Biology George William Hunter
  • Flesh contains no starch or sugar, but a small quantity of glycogen.

  • There exists also in the liver and muscles a non-nitrogenous substance, glycogen, which is detected also in other organs.

  • The glycogen found in yeasts is identical with that found in animal tissues.

    The Chemistry of Plant Life Roscoe Wilfred Thatcher
British Dictionary definitions for glycogen


/ˈɡlaɪkəʊdʒən; -dʒɛn/
a polysaccharide consisting of glucose units: the form in which carbohydrate is stored in the liver and muscles in man and animals. It can easily be hydrolysed to glucose Also called animal starch
Derived Forms
glycogenic (ˌɡlaɪkəʊˈdʒɛnɪk) adjective
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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Word Origin and History for glycogen

starch-like substance found in the liver and animal tissue, 1860, from French glycogène, "sugar-producer," from Greek glykys "sweet" (see glucose) + French -gène (see -gen). Coined in 1848 by French physiologist Claude Bernard (1813-1878).

Online Etymology Dictionary, © 2010 Douglas Harper
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glycogen in Medicine

glycogen gly·co·gen (glī'kə-jən)
A polysaccharide that is the main form of carbohydrate storage in animals and occurs mainly in liver and muscle tissue; it is readily converted to glucose. Also called animal starch.

gly'co·gen'ic (-jěn'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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glycogen in Science
A polysaccharide stored in animal liver and muscle cells that is easily converted to glucose to meet metabolic energy requirements. Most of the carbohydrate energy stored in animal cells is in the form of glycogen.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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