Definition of riser noun from the Oxford Advanced American Dictionary

     

    riser

     noun
    noun
    NAmE//ˈraɪzər//
     
     
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  1. 1early/late riser a person who usually gets out of bed early/late in the morning
  2. 2 (technology) the vertical part between two steps in a set of stairs compare tread
  3. 3risers [plural] a set of wide steps that have several levels and are intended for performers to stand on The chorus went up to the stage and stood on the risers.
See the Oxford Advanced Learner's Dictionary entry: riser