orthoscopic

The story

1. Proto-Indo-European*h₃er-
2. Proto-Indo-European*dʰeh₁-
3. Proto-Indo-European*h₃érdʰeti?
4. Proto-Indo-European*h₃erdʰ-
5. Proto-Hellenic*ortʰwós
6. Ancient Greekὀρθός (orthós)
7. Englishortho-
8. Proto-Indo-European*speḱ-
9. Proto-Indo-European*spéḱyeti
10. Proto-Hellenic*sképt͏̌omai
11. Ancient Greekσκέπτομαι (sképtomai)
12. Ancient Greekσκοπός (skopós)
13. Ancient Greekσκοπέω (skopéō)
14. English todayorthoscopic

From ortho- + -scopic.