BACKBOARD

backboard. Backboard, n. a board to support the back

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Back″board′ (�), n. [[2d back, n. + board.]] 1. 1. A board which supports the back when one is sitting;
specifically, the board athwart the after part of a boat. 2. 2. A board serving as the back part of anything, as of a wagon.
3. 3. A thin stuff used for the backs of framed pictures, mirrors, etc.
4. 4. A board attached to the rim of a water wheel to prevent the water from running off the floats or paddles into the interior of the wheel. W. Nicholson.
5. 5. A board worn across the back to give erectness to the figure. Thackeray.