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Hydrotherapy refers to the use of water in the treatment of disease. Option A, the application of ice, is commonly known as "cryotherapy" and is primarily used to reduce pain and swelling. Option B, the application of heat, is often referred to as "thermotherapy" and is used for relaxation and soothing sore muscles. Option C, the use of electricity in treatment, is known as "electrotherapy" and is used for muscle stimulation and pain relief. Therefore, the use of water in treating diseases is the most accurate definition of hydrotherapy.