washboard

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A board having a corrugated surface on which clothes can be rubbed in the process of laundering.
2. n. Music A similar board used as a percussion instrument.
3. n. A board fastened to a wall at the floor; a baseboard.
4. n. Nautical A thin plank fastened to the side of a boat or to the sill of a port to keep out the sea and the spray.

Century Dictionary and Cyclopedia

1. n. A board or wooden frame having a ribbed or corrugated surface of sheet-metal, vulcanite, earthenware, or wood, used as a scrubber in washing clothing by hand.
2. n. Nautical, a broad thin plank sometimes fixed on the top of the gunwale of a boat or other small vessel's side, to prevent the sea from breaking over; also, a piece of plank on the sill of a lower deck port, for the same purpose. Also called waste-board.
3. n. A board carried around the walls of a room at the bot torn. Also called mopboard, skirting-board.

Wiktionary

1. n. a board with a corrugated surface against which laundry may be rubbed
2. n. music such a board used as a simple percussion instrument
3. n. nautical a board fastened along a ship's gunwale to prevent splashing; a splashboard
4. n. A stretch of ripples or bumps on a dirt or gravel road, mostly occurring at corners; which is caused by wear from traffic, erosion from wet weather, or poor grading.

GNU Webster's 1913

1. n. A fluted, or ribbed, board on which clothes are rubbed in washing them.
2. n. A board running round, and serving as a facing for, the walls of a room, next to the floor; a mopboard.
3. n. (Naut.) A broad, thin plank, fixed along the gunwale of boat to keep the sea from breaking inboard; also, a plank on the sill of a lower deck port, for the same purpose; -- called also wasteboard.

WordNet 3.0

1. n. device consisting of a corrugated surface to scrub clothes on
2. n. protective covering consisting of a broad plank along a gunwale to keep water from splashing over the side