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wellhole

N ช่อง บ่อน้ำ  chang-bor-nam

 

Webster's 1913 Dictionary

WELLHOLE

WELLHOLE 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. W. M. Buchanan.