[glahy-kuh-juhn, -jen]
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.

1855–60; glyco- + -gen Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
glycogen (ˈɡlaɪkəʊdʒən, -dʒɛn)
Also called: animal starch 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

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American Heritage
Medical Dictionary

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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American Heritage
Science Dictionary
glycogen   (glī'kə-jən)  Pronunciation Key 
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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Example sentences
Glycogen turns out to be a crucial piece of the metabolic switch.
Training, diet, race pace and genetics all play a role in glycogen depletion.
The manipulation of diet and exercise, which was shown to drive up glycogen
  levels in the muscles, took its toll on athletes.
The understanding now is that muscle cells convert glucose or glycogen to
  lactic acid.
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