#riser structural member consisting of the vertical part of a stair or step
supertype: #structural_member support that is a constituent part of any structure or building
part of: #stair__step support consisting of a place to rest the foot while ascending or descending a stairway; "he paused on the bottom step"
part of: #stairway__staircase__stairs__steps__step a way of access consisting of a set of steps
part of: #edifice__building a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"
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