riser

Noun
  1. A person who rises (especially from bed) (synset 110552133)
    "he's usually a late riser"
    is a type of: individual, mortal, person, somebody, someone, soul - a human being
    subtypes: early bird - a person who gets up very early in the morning
  2. A vertical pipe in a building (synset 104101953)
    is a type of: pipage, pipe, piping - a long tube made of metal or plastic that is used to carry water or oil or gas etc.
    same as: riser main, riser pipe, riser pipeline
  3. Structural member consisting of the vertical part of a stair or step (synset 104101814)
    is a type of: structural member - support that is a constituent part of any structure or building
    is a part of: stair, step - support consisting of a place to rest the foot while ascending or descending a stairway

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