The story
- Proto-Celtic*bekkos
- Gaulish*bekkosbor.?
- Latinbeccus
- Old Spanishbico
- Spanishpico
- Englishpico-
- Englishcyanobacteria
- Proto-Indo-European*h₂el-
- Proto-Indo-European*h₂élisder.?
- Englishcyanobacterial
- English todaypicocyanobacterial
From pico- + cyanobacterial.
Etymology from Wiktionary, CC BY-SA 4.0.