Where does “quadruply” come from?
quadruply (English) comes from English quadruple, from Latin quadruplus, from Latin quattŭor, from Portuguese quarto, from Old Portuguese quarto, from Latin quārtus, from Proto-Indo-European kʷeturtos, from Proto-Indo-European kʷetwóres — and.
quadruply (English): four times; in four ways
Ancestry of “quadruply”, step by step