superacoustic

The story

1. Proto-Indo-European*úp
2. Proto-Indo-European*upér
3. Proto-Italic*super
4. Latinsuper
5. Latinsuper-
6. Englishsuper-
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 todaysuperacoustic

From super- + acoustic.