interbacterial

The story

1. Proto-Indo-European*h₁én
2. Proto-Indo-European*h₁n̥tér
3. Proto-Italic*n̥ter
4. Latininter
5. Latininter-
6. Englishinter-
7. Ancient Greekβακτηρία (baktēría)
8. Ancient Greekβακτήριον (baktḗrion)
9. New Latinbactēria
10. Englishbacteria
11. Proto-Indo-European*h₂el-
12. Proto-Indo-European*h₂élisder.?
13. Englishbacterial
14. English todayinterbacterial

From inter- + bacterial.