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riser

/ˈɹaɪ.zə(ɹ)/ noun

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about riser at Wordnik → Where our words come from →

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

Origin

From Middle English ryser, risere, equivalent to rise + -er.

From Wiktionary, via Kaikki.org (CC BY-SA)