| 1 | English | therapeutic | Of, or relating to therapy; Having a positive... |
| 2 | New Latin | therapeuticus | curing, healing |
| 3 | Ancient Greek | θεραπευτικός | attentive, helpful, obliging, curative |
| 4 | Ancient Greek | θεραπευτής | One who waits upon another; attendant |
| 5 | Ancient Greek | -τής | Appended to verbs to form agent nouns |
| 6 | Ancient Greek | πεῖρα | trial, experiment, attempt |
| 7 | Proto-Indo-European | per- | before, in front; first; to go through |
| 8 | Proto-Indo-European | pr̥tós | passed , crossed |