WASHBOARD

n. board with corrugated surface for scrubbing laundry; musical instrument that looks like a washboard and used as a percussion instrument to produce a scratching sound (Music); thin and wide board placed on a boat's gunwale to prevent water from splashing over the side (Nautical); mopboard, baseboard, narrow board along the base of an interior wall; road surface that is uneven and rough (term used in USA & Canada)