The story
- Proto-Indo-European*speḱ-
- Proto-Indo-European*spéḱyeti
- Proto-Italic*spekjō
- Latinspeciō
- Latinspectrum
- Englishspectrum
- Englishspectro-
- Proto-Indo-European*spéḱyeti
- Proto-Hellenic*sképt͏̌omai
- Ancient Greekσκέπτομαι (sképtomai)
- Ancient Greekσκοπός (skopós)
- Ancient Greekσκοπέω (skopéō)
- Latinspectrum
- Frenchspectro-
- Ancient Greekσκοπέω (skopéō)
- Frenchspectroscopie
- Frenchspectroscopique
- Englishspectroscopic
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Proto-Indo-European*leyg-
- Proto-Germanic*līką
- English todayspectroscopically
From spectroscopic + -ally.
Etymology from Wiktionary, CC BY-SA 4.0.