riser

名词 riser:

1. a person who rises (especially from bed)
2. a vertical pipe in a building
   同义词：riser pipe, riser pipeline, riser main
3. structural member consisting of the vertical part of a stair or step

1. A notched board at either side of a staircase that supports the treads and risers.
   木楼梯侧板，木楼梯小梁在阶梯两边支撑楼梯的踏板和竖板的有凹口的木板

ris.er

n.（名词）
One who rises, especially from sleep:
起床的人：起床的人，尤指睡觉后起床：
例句：
She is a late riser.
她是一个起床晚的人

The vertical part of a stair step.
楼梯的踏步竖板：楼梯的竖直部分