wallpaper Syllabification: (wall·pa·per)Pronunciation: /ˈwôlˌpāpər/Translate wallpaper | into French | into German | into Italian | into Spanish Definition of wallpaper noun paper that is pasted in vertical strips over the walls of a room to provide a decorative or textured surface. Computing an optional background pattern or picture on a computer or mobile phone screen. verb [with object] apply wallpaper to (a wall or room). wallpaper in other Oxford dictionaries Definition of wallpaper in the British & World English dictionary