Where does “ξηρασία” come from?

ξηρασία (Ancient Greek) comes from Ancient Greek ξηρός, from Proto-Indo-European kseros.

Ancestry of “ξηρασία”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	ξηρός	dry; The effects of being without water: parched,...
2	Proto-Indo-European	kseros	—

ξηρασία — Etymology, Origin & Word History | Etymology Explorer