from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An upright surface or border, as of tile, that protects the wall behind a sink or stove.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A vertical covering on a wall rising above a countertop or other work surface to protect the wall from spills and to decorate the wall.
back + splash (Wiktionary)