the.com/electrotherapy

means The medical use of electrical currents applied to the body to treat pain, stimulate muscles or nerves, or promote healing.

from Built from Greek 'elektron' (amber, the substance Greeks noticed produced static charge when rubbed) plus 'therapeia' (treatment, healing service). The electrical half of the word only became meaningful once 18th and 19th-century experimenters like Galvani and Franklin showed electricity could animate muscle and nerve — after which doctors and quacks alike rushed to zap patients with everything from mild currents to outright shock boxes, long before the practice settled into the more careful, evidence-based therapy used today.