aero-hydro-servo-elasticity

The story

1. Proto-Indo-European*h₂ews-
2. Proto-Indo-European*h₂ewsér
3. Proto-Hellenic*auhḗr
4. Ancient Greekᾱ̓ήρ (āḗr)
5. Ancient Greekἀέρος (aéros)
6. Englishaero-
7. Proto-Indo-European*wed-
8. Proto-Indo-European*wódr̥
9. Proto-Hellenic*údōr
10. Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
11. Ancient Greekῠ̔δρο- (hŭdro-)
12. Englishhydro-
13. Proto-Indo-European*ser-der.?
14. Proto-Italic*serwos
15. Latinservus
16. Englishservo-
17. Proto-Indo-European*h₁elh₂-
18. Proto-Indo-European*h₁l̥h₂-tós
19. Ancient Greekἐλᾰστός (elăstós)
20. New Latinelasticu
21. Frenchélastique
22. Englishelastic
23. Englishelasticity
24. English todayaero-hydro-servo-elasticity

From aero- + hydro- + servo- + elasticity.