The story
- Proto-Indo-European*h₁én
- Proto-Indo-European*h₁n̥tér
- Proto-Italic*n̥ter
- Latininter
- Latininter-
- Englishinter-
- Proto-Indo-European*h₃ed-
- Proto-Indo-European*h₃dónts
- Proto-Italic*dents
- Latindēns
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Medieval Latindentālis
- Middle Frenchdenta
- Late Latindentālis
- Englishdental
- Englishinterdental
- English todayinterdentally
From interdental + -ly.
Etymology from Wiktionary, CC BY-SA 4.0.