The story
- Proto-Indo-European*kʷetwóres
- Proto-Hellenic*kʷétwores
- Ancient Greekτέσσᾰρες (téssăres)
- Ancient Greekτετρᾰ- (tetră-)
- Englishtetra-
- Proto-Indo-European*médʰu
- Proto-Hellenic*métʰu
- Ancient Greekμέθυ (méthu)
- Proto-Indo-European*swel-der.?
- Ancient Greekῡ̔́λη (hū́lē)
- GermanMethy
- Englishmethyl
- Englishtetramethyl
- Proto-Indo-European*h₁wers-
- Ancient Greekοὐρέω (ouréō)
- Ancient Greekοὖρον (oûron)
- Frenchurée
- Englishurea
- Englishtetramethylurea
- New Latinammōnium
- Englishammonium
- Englishonium
- English todaytetramethyluronium
From tetramethylurea + -onium.
Etymology from Wiktionary, CC BY-SA 4.0.