Therapeutic means helping to cure or to relieve suffering. A therapeutic dose, therapeutic value, therapeutic gardening.
The loose sense is now the commoner, and calling anything therapeutic means it made somebody feel better rather than that it treated anything. In medicine the therapeutic window is the gap between a dose that works and one that harms.
1adjectivetherapeuticHelping to cure or to relieve suffering.
“The hot spring water is said to have therapeutic effects for people with joint pain.”
therapeutic is a quality.
Greek therapeutikos comes from therapeuein, to attend to or heal.
Ancient Greek
θεραπευτικός — attentive, helpful, obliging, curative
New Latin
therapeuticus — curing, healing
Middle English
terapeucia
English, today
therapeutic
Built from
From Middle English terapeucia, from New Latin therapeuticus (“curing, healing”), from Ancient Greek θεραπευτικός (“attentive, helpful, obliging, curative”), from θεραπευτής (“one who waits on another, an attendant”), from θεραπεύω (“I wait on, attend, serve, cure”).
Etymology from Wiktionary, CC BY-SA