transdiagnostic

The story

1. Proto-Indo-European*terh₂-
2. Proto-Indo-European*térh₂t
3. Proto-Indo-European*tr̥h₂ónts
4. Proto-Indo-European*tr̥h₂n̥ts
5. Proto-Italic*trāns
6. Proto-Italic*trāns-
7. Latintrans-
8. Englishtrans-
9. Proto-Indo-European*dwóh₁
10. Proto-Indo-European*trísinflu.
11. Proto-Indo-European*dwís
12. Ancient Greekδιά (diá)
13. Ancient Greekδια- (dia-)
14. Proto-Indo-European*ǵneh₃-
15. Proto-Indo-European*ǵn̥h₃sḱéti
16. Proto-Hellenic*gignṓskō
17. Ancient Greekγῐγνώσκω (gĭgnṓskō)
18. Ancient Greekδῐαγῐγνώσκω (dĭagĭgnṓskō)
19. Ancient Greekδῐᾰ́γνωσῐς (dĭắgnōsĭs)
20. Ancient Greekδῐᾰ- (dĭă-)
21. Proto-Indo-European*ǵneh₃-
22. Proto-Indo-European*ǵneh₃tis
23. Ancient Greekγνῶσις (gnôsis)
24. Ancient Greekγνωστῐκός (gnōstĭkós)
25. Ancient Greekδῐαγνωστῐκός (dĭagnōstĭkós)
26. Englishdiagnostic
27. English todaytransdiagnostic

From trans- + diagnostic.