The story
- Proto-Indo-European*dwóh₁
- Proto-Indo-European*dwi-
- Proto-Italic*dwi-
- Latinbi-
- Englishbi-
- Proto-Indo-European*h₂eǵ-?
- Proto-Indo-European*h₂eḱs-
- Proto-Italic*aksis
- Latinaxis
- Englishaxis
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishaxial
- English todaybiaxial
Etymology from Wiktionary, CC BY-SA 4.0.