wellhole

[wel-hohl]
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noun

the shaft of a well.
a tall, narrow opening surrounded by walls, as a stairwell.

Origin of wellhole

First recorded in 1670–80; well2 + hole
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for well-hole

Historical Examples of well-hole