GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Wellhole , n.
   1913 Webster
   (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.
   1913 Webster
   A cavity which receives a counterbalancing weight in certain mechanical contrivances, and is adapted also for other purposes.
   W. M. Buchanan.
   
   1913 Webster