Where does “cianobatterio” come from?

cianobatterio (Italian) comes from Italian batterio, from New Latin bactērium, from Ancient Greek βακτήριον, from Ancient Greek βακτηρία, from Proto-Indo-European baḱ- — club, pointed stick, peg; pointed stick, peg.

cianobatterio (Italian): cyanobacterium, blue-green alga; sea sawdust

Definitions

cyanobacterium, blue-green alga; sea sawdust

Ancestry of “cianobatterio”, step by step

Step	Language	Word	Meaning
1	Italian	batterio	bacterium
2	New Latin	bactērium	—
3	Ancient Greek	βακτήριον	Synonym of βακτηρία
4	Ancient Greek	βακτηρία	rod, staff, cane; baton
5	Proto-Indo-European	baḱ-	club, pointed stick, peg; pointed stick, peg

Every word from Proto-Indo-European baḱ- →Every word from Ancient Greek βακτηρία →Every word from Ancient Greek βακτήριον →