Where does “puritia” come from?

puritia (Latin) comes from Latin pūrus, from Proto-Indo-European pewH- — to be clean, pure.

Ancestry of “puritia”, step by step

Step	Language	Word	Meaning
1	Latin	pūrus	—
2	Proto-Indo-European	pewH-	to be clean, pure

puritia — Etymology, Origin & Word History | Etymology Explorer