wellhole

English

Etymology

well +‎ hole

Noun

wellhole (plural wellholes)

  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.
    • 1846, W. M. Buchanan, The Dictionary of Science and Technical Terms Used in Philosophy, Literature...:
      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.

References

wellhole in Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913

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