The story
- Proto-Indo-European*per-der.?
- Proto-Indo-European*pér
- Proto-Italic*per
- Latinper
- Proto-Indo-European*per-
- Proto-Italic*peri-
- Latinper-
- Englishper-
- Proto-Indo-European*wed-
- Proto-Indo-European*wódr̥
- Proto-Hellenic*údōr
- Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
- Ancient Greekῠ̔δρο- (hŭdro-)
- Englishhydro-
- Ancient Greekῐ̓́σος (ĭ́sos)
- Englishiso-
- Englishquinine
- Englishquinoline
- Englishisoquinoline
- English todayperhydroisoquinoline
From per- + hydro- + isoquinoline.
Etymology from Wiktionary, CC BY-SA 4.0.