n. A facing of thin boards, having usually a feather-edge, and nailed lapping one over another, used as an outside covering for the walls of a wooden building. They are practically the same as clapboards, but are distinguished from those by being larger and wider.n. The finish or woodwork at the base of a clapboarded wall.n. The whole exterior covering of a wall or roof, whether of weather-boards, clapboards, or shingles