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*me
- Proto-Indo-European*meth₂?
- Ancient Greekμετᾰ́ (metắ)
- Ancient Greekμετα- (meta-)
- Proto-Indo-European*gʷelH-
- Proto-Hellenic*gʷəlnō
- Ancient Greekβάλλω (bállō)
- Ancient Greekμεταβάλλω (metabállō)
- Ancient Greekμετᾰβολή (metăbolḗ)
- Englishmetabolism
- English todayphotometabolism
From photo- + metabolism.
Etymology from Wiktionary, CC BY-SA 4.0.