The story
- Proto-Indo-European*bʰeh₂-
- Proto-Indo-European*bʰéh₂os
- Proto-Hellenic*pʰáwos
- Ancient Greekφᾰ́ος (phắos)
- Ancient Greekφῶς (phôs)
- Ancient Greekφωτο- (phōto-)
- Englishphoto-
- Ancient Greekβακτηρία (baktēría)
- Ancient Greekβακτήριον (baktḗrion)
- New Latinbactērium
- Englishbacteri(um)
- Proto-Indo-European*kh₂eyd-
- Proto-Indo-European*kh₂éydeti
- Proto-Italic*kaidō
- Latincaedō
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishbactericidal
- English todayphotobactericidal
From photo- + bactericidal.
Etymology from Wiktionary, CC BY-SA 4.0.