explain the definition Give the definitions 1) Give the full form of DM. Define the DM.(Give the full form of DM and define the DM.) The full form of DM IS DIABETES MALLITUS. Diabetes Mellitus is a chronic metabolic disorder characterized by impairment in carbohydrate, protein and lipid metabolism. Mainly carbohydrate metabolism is altered. Diabetes is a condition in which the blood glucose level of a person’s body increases (Hyperglycemia).