The story
- Proto-Indo-European*né
- Proto-Indo-European*n̥-
- Proto-Hellenic*ə-
- Ancient Greekᾰ̓- (ă-)
- Ancient Greekἀν- (an-)
- Englishan-
- 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*speḱ-
- Proto-Indo-European*spéḱyeti
- Proto-Hellenic*sképt͏̌omai
- Ancient Greekσκέπτομαι (sképtomai)
- Ancient Greekσκοπός (skopós)
- Ancient Greekσκοπέω (skopéō)
- Englishanorthoscope
- English todayanorthoscopic
From anorthoscope + -ic.
Etymology from Wiktionary, CC BY-SA 4.0.