aeroacoustic

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*h₂eḱ-
8. Proto-Indo-European*h₂ew-
9. Proto-Indo-European*h₂ṓws
10. Proto-Indo-European*h₂ḱh₂owsyéti
11. Proto-Hellenic*akóuhō
12. Ancient Greekἀκούω (akoúō)
13. Ancient Greekᾰ̓κουστῐκός (ăkoustĭkós)
14. Medieval Latinacousticus
15. Englishacoustic
16. English todayaeroacoustic

From aero- + acoustic.