Ris"er (?), n. 1. One who rises; as, an early riser.

2. (Arch.) (a) The upright piece of a step, from tread to tread. Hence: (b) Any small upright face, as of a seat, platform, veranda, or the like.

3. (Mining) A shaft excavated from below upward.

4. (Founding) A feed head. See under Feed, n.

Ris"er (?), n. 1. One who rises; as, an early riser.

2. (Arch.) (a) The upright piece of a step, from tread to tread. Hence: (b) Any small upright face, as of a seat, platform, veranda, or the like.

3. (Mining) A shaft excavated from below upward.

4. (Founding) A feed head. See under Feed, n.

• Someone or something which rises.
  
• A platform or stand used to lift or elevate something.
       The choir stood on risers for the performance.
  
• The vertical part of a step on a staircase