Where does “quadro” come from?

quadro (Latin) comes from Latin quādrus, from Latin quattŭor, from Portuguese quarto, from Old Portuguese quarto, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

quadro (Latin): to make four-cornered, square, make square