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Glycogen, glī′kō-jen, n. animal starch, a substance first discovered by Claude Bernard in the human liver—when pure, a white, amorphous, tasteless powder, insoluble in alcohol.

Glycogen, or "animal starch," is one of the most widely distributed reserve foods of the animal body; in fact, it is the only known form of carbohydrate-reserve in animal tissues.

Its cells also store up, “in the form of a kind of animal starch called glycogen,” excess of starchy or sugary food absorbed from the intestine during the digestion of a meal.

Glycogen is, on this account, called animal starch.

The human body contains a small amount of a substance called glycogen, which is an animal starch or sugar.