Definition of riser noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈraɪzə(r)//
    ; NAmE 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(specialist) the vertical part between two steps in a set of stairs compare tread
See the Oxford Advanced American Dictionary entry: riser