The story
- Proto-Indo-European*wed-
- Proto-Indo-European*wódr̥
- Proto-Hellenic*údōr
- Ancient Greekῡ̆̔́δωρ (hū̆́dōr)
- Ancient Greekὑδρο- (hudro-)
- Frenchhydro-
- Proto-Indo-European*ǵenh₁-
- Proto-Indo-European*ǵénh₁os
- Proto-Hellenic*génos
- Ancient Greekγένος (génos)
- Frenchhydrogène
- Englishhydrogen
- Proto-Indo-European*h₂eḱ-der.?
- Ancient Greekὀξύς (oxús)
- Ancient Greekγένος (génos)
- Frenchoxygène
- Englishoxygen
- Proto-Indo-European*swel-der.?
- Ancient Greekῡ̔́λη (hū́lē)
- Englishhydroxyl
- Englishhydroxy-
- GermanTryptophan
- Englishtryptophan
- English todayhydroxytryptophan
From hydroxy- + tryptophan.
Etymology from Wiktionary, CC BY-SA 4.0.