A board which supports the back wen one is sitting;
A board serving as the back part of anything, as of a wagon.
A thin stuff used for the backs of framed pictures, mirrors, etc.
A board attached to the rim of a water wheel to prevent the water from running off the floats or paddies into the interior of the wheel. W. Nicholson.
A board worn across the back to give erectness to the figure. Thackeray.
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