01 n. A board which supports the back when one is sitting;
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1.
A board which supports the back when one is sitting;
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2.
A board serving as the back part of anything, as of a wagon.
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3.
A thin stuff used for the backs of framed pictures, mirrors, etc.
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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.
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5.
A board worn across the back to give erectness to the figure.