1. Structural member consisting of the vertical part of a stair or step
   "The carpenter carefully measured each riser to ensure the stairs were even"
    
2. A vertical pipe in a building
   "The plumber inspected the riser pipe for any leaks";
   - riser pipe, riser pipeline, riser main
    
3. A person who rises (especially from bed)
   "he's usually a late riser"

Derived forms: risers

Type of: actor, doer, pipage, pipe, piping, structural member, worker

Part of: stair, step

Encyclopedia: Riser, Paul