sandpaperPronunciation: /ˈsan(d)peɪpə/Translate sandpaper | into French | into German | into Italian | into Spanish Definition of sandpaper noun [mass noun] paper with sand or another abrasive stuck to it, used for smoothing or polishing woodwork or other surfaces. verb [with object] smooth with sandpaper. Derivatives sandpapery adjective sandpaper in other Oxford dictionaries Definition of sandpaper in the US English dictionary