Where does “penteteris” come from?

penteteris (English) comes from Ancient Greek πεντετηρίς, from Ancient Greek ἔτος, from Ancient Greek ϝέτος, from Proto-Indo-European wétos, from Proto-Indo-European wet- — year; year-old.

Ancestry of “penteteris”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	πεντετηρίς	penteteris
2	Ancient Greek	ἔτος	year
3	Ancient Greek	ϝέτος	—
4	Proto-Indo-European	wétos	year
5	Proto-Indo-European	wet-	year; year-old

Every word from Proto-Indo-European wet- →Every word from Proto-Indo-European wétos →Every word from Ancient Greek ϝέτος →