Backboard

·noun A board which supports the back wen one is sitting;.

II. Backboard ·noun A board serving as the back part of anything, as of a wagon.

III. Backboard ·noun A board worn across the back to give erectness to the figure.

IV. Backboard ·noun A thin stuff used for the backs of framed pictures, mirrors, ·etc.

V. Backboard ·noun 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.