Where does “catur” come from?
catur (Pali) comes from Sanskrit चतुर्, from Proto-Indo-Aryan ćatwā́ras, from Proto-Indo-Iranian čatwā́ras, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.
catur (Pali): four
Ancestry of “catur”, step by step