Where does “quatre-vingts” come from?
quatre-vingts (French) comes from French quatre, from Old French quatre, from Latin quattŭor, from Portuguese quarto, from Old Portuguese quarto, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres — and.
quatre-vingts (French): eighty, 80
Ancestry of “quatre-vingts”, step by step