Where does “tri-quarter” come from?
tri-quarter (English) comes from English quarter, from Middle English quarter, from Anglo-Norman quarter, from Latin quartarius, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.
tri-quarter (English): three-quarter
Ancestry of “tri-quarter”, step by step