Where does “oidium” come from?

oidium (Romanian) comes from French oïdium, from Late Latin oidium, from Ancient Greek ᾠόν, from Proto-Hellenic ōyyón, from Proto-Indo-European h₂ōwyóm, from Proto-Indo-European h₂éwis — bird.

oidium (Romanian): powdery mildew

Definitions

powdery mildew

Ancestry of “oidium”, step by step

Step	Language	Word	Meaning
1	French	oïdium	powdery mildew
2	Late Latin	oidium	—
3	Ancient Greek	ᾠόν	egg; seed
4	Proto-Hellenic	ōyyón	egg
5	Proto-Indo-European	h₂ōwyóm	egg
6	Proto-Indo-European	h₂éwis	bird

Every word from Proto-Indo-European h₂éwis →Every word from Proto-Indo-European h₂ōwyóm →Every word from Proto-Hellenic ōyyón →