The story
- Englishplasto-
- Proto-Indo-European*sem-
- Proto-Indo-European*sēmi
- Latinsēmi-
- Englishsemi-
- Englishquinine
- Englishquinic
- GermanKeton
- Englishketone
- Englishquinone
- Englishsemiquinone
- English todayplastosemiquinone
From plasto- + semiquinone.
Etymology from Wiktionary, CC BY-SA 4.0.