enterobacterial

The story

1. Proto-Indo-European*h₁én
2. Proto-Indo-European*h₁énteros
3. Ancient Greekἔντερον (énteron)
4. New Latinentero-
5. Englishentero-
6. Ancient Greekβακτηρία (baktēría)
7. Ancient Greekβακτήριον (baktḗrion)
8. New Latinbactēria
9. Englishbacteria
10. Proto-Indo-European*h₂el-
11. Proto-Indo-European*h₂élisder.?
12. Englishbacterial
13. English todayenterobacterial

From entero- + bacterial.