The story
- Proto-Indo-European*ser-
- Proto-Indo-European*sér-o-
- Proto-Italic*serom
- Latinserum
- Englishserum
- Englishsero-
- Proto-Indo-European*ten-
- Proto-Indo-European*tónos
- Proto-Hellenic*tónos
- Ancient Greekτόνος (tónos)
- Latintonus
- Middle Englishtone
- Englishtone
- Englishseroton(in)
- English todayserotonergic
From seroton(in) + -ergic.
Etymology from Wiktionary, CC BY-SA 4.0.