raiser

Noun

 * 1) A person or thing that raises.
 * 2) A kind of armchair with a standing-up system.
 * 3)  The upright board on the front of a step in a flight of steps.
 * 1) A kind of armchair with a standing-up system.
 * 2)  The upright board on the front of a step in a flight of steps.