backboard

noun

1. a board placed at or forming the back of anything.
2. Basketball. a board or other flat vertical surface to which the basket is attached.

noun

1. a board that is placed behind something to form or support its back
2. a board worn to straighten or support the back, as after surgery
3. (in basketball) a flat upright surface supported on a high frame, under which the basket is attached

n.

1. A board placed under or behind something to provide firmness or support.
2. A board placed beneath the body of a person with an injury to the neck or back, used especially in transporting the person in such a way as to avoid further injury.