a person who habitually gets out of bed at a particular time of the morning

late risers always exasperate early risers

a vertical section between the treads of a staircase

make risers low and treads deep

a vertical pipe for the upward flow of liquid or gas

this pressure carries water through the risers to the upper floors

the main gas riser there was relocated

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

he fell backwards off the riser

half a drum riser collapsed during my solo

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

constantly adjust the risers to keep the wing overhead