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*h₁elh₂-
- Proto-Indo-European*h₁l̥h₂-tós
- Ancient Greekἐλᾰστός (elăstós)
- New Latinelasticu
- Frenchélastique
- Englishelastic
- Englishelasticity
- English todayphotoelasticity
From photo- + elasticity.
Etymology from Wiktionary, CC BY-SA 4.0.