<p><strong>Noun:</strong></p><ul><li>A rectangular board or frame, typically with a corrugated metallic surface, on which clothes are rubbed in the process of washing</li><li>A baseboard around the walls of a room (also called splashboard)</li><li>A thin, broad plank fastened to and projecting above the gunwale or side of a boat to keep out the spray and sea</li><li>A similar board on the sill of a port</li></ul><p><strong>Adjective:</strong></p><ul><li>Resembling a washboard in being rough and bumpy: a washboard roadbed</li></ul>