noun
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a flat piece of wood or similar material, often rectangular, for some special use; a board.
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a large, smooth, usu. dark surface of slate or other material on which to write or draw with chalk; chalkboard; a black-board.
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one side of a leaf of a book, newspaper, letter, etc.; a page.
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a broad, metal sheet held by policemen, soldiers to ward off blows, missiles, etc.; a shield.
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a fruit.