pathoetiology

The story

1. Ancient Greekπάσχω (páskhō)
2. Ancient Greekπᾰ́θος (pắthos)
3. Englishpatho-
4. Proto-Indo-European*h₂ey-
5. Ancient Greekαἰτῐ́ᾱ (aitĭ́ā)
6. Proto-Indo-European*leǵ-
7. Proto-Indo-European*lóǵos
8. Proto-Hellenic*lógos
9. Ancient Greekλόγος (lógos)
10. Ancient Greekαἰτῐολογῐ́ᾱ (aitĭologĭ́ā)
11. Latinaetiologia
12. Englishetiology
13. English todaypathoetiology

From patho- + etiology.