The story
- Proto-Indo-European*bʰeh₂-
- Proto-Indo-European*bʰéh₂os
- Proto-Hellenic*pʰáwos
- Ancient Greekφᾰ́ος (phắos)
- Ancient Greekφῶς (phôs)
- Ancient Greekφωτο- (phōto-)
- Englishphoto-
- 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
- English todayphotospectroscopic
From photo- + spectroscopic.
Etymology from Wiktionary, CC BY-SA 4.0.