Also found in: Dictionary, Thesaurus, Legal, Encyclopedia.
a form of glycogen storage disease in which abnormally large amounts of glycogen are deposited in the skeletal muscle. The disorder is characterized by hemolysis and cramping on exercise but no rise in blood lactate. Biopsy of the affected organ reveals the absence of the enzyme phosphofructokinase. Also called glycogen storage disease type VII. See also glycogen storage disease.