From Middle English terapeucia, from New Latin therapeuticus (“curing, healing”), from Ancient Greek θεραπευτικός (therapeutikós, “attentive, helpful, obliging, curative”), from θεραπευτής (therapeutḗs, “one who waits on another, an attendant”), from θεραπεύω (therapeúō, “I wait on, attend, serve, cure”).