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1 definition found

From: Webster's Revised Unabridged Dictionary (1913)

 Well·hole n.
 1. Arch. (a) The open space in a floor, to accommodate a staircase.  (b) The open space left beyond the ends of the steps of a staircase.
 2. A cavity which receives a counterbalancing weight in certain mechanical contrivances, and is adapted also for other purposes.
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