Where does “-πνοια” come from?

-πνοια (Ancient Greek) comes from Ancient Greek πνοή, from Ancient Greek -ή, from Ancient Greek -ᾱ, from Proto-Indo-European -éh₂.

Ancestry of “-πνοια”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πνοή	breath
2	Ancient Greek	-ή	—
3	Ancient Greek	-ᾱ	nominal suffix
4	Proto-Indo-European	-éh₂	—