wellhole

名词 n.
中文释义

英文释义

名词 n.
  1. The open space in a floor, to accommodate a staircase.
  2. The open space left beyond the ends of the steps of a staircase.
    — well-holes of the stairs and chimney
  3. A cavity which receives a counterbalancing weight in certain mechanical contrivances, and is adapted also for other purposes.

词形变化

wellholes plural

词源

From well + hole.
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