Therapy

google

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mid 19th century: from modern Latin therapia, from Greek therapeia ‘healing’, from therapeuein ‘minister to, treat medically’.

wiktionary

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From New Latin therapīa, from Ancient Greek θεραπεία(therapeía, “service, medical treatment”), from θεραπεύω(therapeúō, “I serve, treat medically”).

etymonline

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therapy (n.)

1846, "medical treatment of disease," from Modern Latin therapia, from Greek therapeia "curing, healing, service done to the sick; a waiting on, service," from therapeuein "to cure, treat medically," literally "attend, do service, take care of" (see therapeutic).