The story
- Proto-Indo-European*h₃er-
- Proto-Indo-European*dʰeh₁-
- Proto-Indo-European*h₃érdʰeti?
- Proto-Indo-European*h₃erdʰ-
- Proto-Hellenic*ortʰwós
- Ancient Greekὀρθός (orthós)
- Englishortho-
- Proto-Indo-European*līnom
- Proto-Italic*līnom
- Latinlīnum
- Latinlīneus
- Latinlīnea
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Latinlīneāris
- Englishlinear
- English todayortholinear
Etymology from Wiktionary, CC BY-SA 4.0.