The story
- Proto-Indo-European*h₂el-
- Latinūls
- Latinultrā
- Englishultra-
- Englishmicrobacteria
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishmicrobacterial
- English todayultramicrobacterial
From ultra- + microbacterial.
Etymology from Wiktionary, CC BY-SA 4.0.