From Longman Dictionary of Contemporary Englishsplashbacksplash‧back /ˈsplæʃbæk/ noun [countable] British English DHHthe area of a bathroom or kitchen wall that is behind the taps and covered in tiles
Examples from the Corpus
splashback• Re-tile the splashback between counter top and wall-hung cupboards.• The sink was squared-off and old fashioned, with a white splashback and a tilting mirror. 