hydrodynamically

The story

1. Proto-Indo-European*wed-
2. Proto-Indo-European*wódr̥
3. Proto-Hellenic*údōr
4. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
5. Ancient Greekῠ̔δρο- (hŭdro-)
6. Englishhydro-
7. Proto-Indo-European*dewh₂-
8. Proto-Hellenic*dunamai
9. Ancient Greekδῠ́νᾰμαι (dŭ́nămai)
10. Ancient Greekδύναμις (dúnamis)
11. Ancient Greekδυναμικός (dunamikós)
12. Frenchdynamique
13. Englishdynamic
14. Englishhydrodynamic
15. Proto-Indo-European*h₂el-
16. Proto-Indo-European*h₂élisder.?
17. Proto-Indo-European*leyg-
18. Proto-Germanic*līką
19. English todayhydrodynamically

From hydrodynamic + -ally.