Where does “quartana” come from?

quartana (Latin) comes from Latin quartānus, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

Ancestry of “quartana”, step by step

Step	Language	Word	Meaning
1	Latin	quartānus	—
2	Latin	quārtus	—
3	Proto-Indo-European	kʷeturtos	—
4	Proto-Indo-European	kʷetwóres	four
5	Proto-Indo-European	kʷe-	and

Every word from Proto-Indo-European kʷe- →