The story
- Proto-Indo-European*médʰu
- Proto-Hellenic*métʰu
- Ancient Greekμέθυ (méthu)
- Proto-Indo-European*swel-der.?
- Ancient Greekῡ̔́λη (hū́lē)
- GermanMethy
- Englishmethyl
- Englishvalerian
- Englishvaleric
- GermanKeton
- Englishketone
- English todaymevalonic
From me(thyl-dihydroxy) + val(eric acid) + -onic.
Etymology from Wiktionary, CC BY-SA 4.0.