The story
- Proto-Indo-European*h₂eḱ-
- Proto-Indo-European*h₂ew-
- Proto-Indo-European*h₂ṓws
- Proto-Indo-European*h₂ḱh₂owsyéti
- Proto-Hellenic*akóuhō
- Ancient Greekἀκούω (akoúō)
- Ancient Greekᾰ̓κουστῐκός (ăkoustĭkós)
- Medieval Latinacousticus
- Englishacoustic
- Englishacousto-
- Proto-Indo-European*megʰ-der.?
- Ancient Greekμηχανή (mēkhanḗ)
- Ancient Greekμηχανικός (mēkhanikós)
- Latinmēchanicus
- Old Frenchmecanique
- Middle Englishmechanic
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Middle Englishmechanical
- Englishmechanical
- English todayacoustomechanical
From acousto- + mechanical.
Etymology from Wiktionary, CC BY-SA 4.0.