The story
- English(di)chl(oroph)en(yl)
- Proto-Indo-European*tréyes
- Proto-Indo-European*tri-
- Proto-Indo-European*tritós
- Proto-Italic*tritios
- Latintertius
- Englishtert-
- Proto-Indo-European*gʷṓws
- Proto-Hellenic*gʷous
- Ancient Greekβοῦς (boûs)
- Proto-Indo-European*tewh₂-
- Proto-Indo-European*tuh₂rós
- Proto-Hellenic*tūrós
- Ancient Greekτῡρός (tūrós)
- Ancient Greekβούτῡρος (boútūros)
- Englishbut-
- Proto-Indo-European*swel-der.?
- Ancient Greekῡ̔́λη (hū́lē)
- Englishbutyl
- Englishtert-butyl
- Englisharterenol?
- English todayclenbuterol
From (di)chl(oroph)en(yl) + -buterol (“phenethylamine derivative”).
Etymology from Wiktionary, CC BY-SA 4.0.