a polysaccharide, (CHO), produced and stored in animal tissues, esp. in the liver and muscles, and changed into glucose as the body needs it
See glycogen in American Heritage Dictionary 4
(glīˈkə-jən)
noun
A polysaccharide, (C6H10O5)n, that is the main form of carbohydrate storage in animals and occurs primarily in the liver and muscle tissue. It is readily converted to glucose as needed by the body to satisfy its energy needs. Also called animal starch.