Someone or something which rises. / A platform or stand used to lift or elevate something. / The vertical part of a step on a staircase. / (archery) The main body of a bow.

plural of riser

A surname.

plural of Riser

A bed comprising a top frame and mattress and another that can be collapsed and stashed beneath the first.

plural of high-riser

plural of dry riser

A main vertical pipe, usually kept empty, intended to distribute water to multiple levels of a building in the event of a fire.

(informal) The drug sildenafil citrate marketed as Viagra.

Someone who rises (gets up) early in the morning.