volumen
/boˈlumen/ · B1 · noun · m
volume
📚🔊 Latin volumen = a rolled scroll, from volvere, to roll
Ancient books were rolled scrolls, so a volumen was one book. A thick roll takes up space, which gave the sense of size or bulk, and later loudness. In Spanish the v sounds like b: bo-LU-men, with the stress on LU.