riser

noun

• 1 [with adjective] a person who habitually gets out of bed at a particular time of the morning:late risers always exasperate early risers

• 2a vertical section between the treads of a staircase.

• 3a vertical pipe for the upward flow of liquid or gas.

• 4a low platform on a stage or in an auditorium, used to give greater prominence to a speaker or performer.

• 5a strip of webbing joining the harness and the rigging lines of a parachute or paraglider.