microacoustic

The story

1. Proto-Indo-European*mey-der.?
2. Ancient Greekμῑκρός (mīkrós)
3. Ancient Greekμῑκρο- (mīkro-)
4. Englishmicro-
5. Proto-Indo-European*h₂eḱ-
6. Proto-Indo-European*h₂ew-
7. Proto-Indo-European*h₂ṓws
8. Proto-Indo-European*h₂ḱh₂owsyéti
9. Proto-Hellenic*akóuhō
10. Ancient Greekἀκούω (akoúō)
11. Ancient Greekᾰ̓κουστῐκός (ăkoustĭkós)
12. Medieval Latinacousticus
13. Englishacoustic
14. English todaymicroacoustic

From micro- + acoustic.