wellhole

noun

1

: the hole, pit, or shaft of a well

2

a

: the open space in a floor or through a series of floors for the accommodation of a staircase

b

: the open space about which the stairs of a winding or circular staircase turn

3

: a cavity for movement of a counterbalance or similar mechanical device

Word History

First Known Use

1663, in the meaning defined at sense 2a

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

• More than 250,000 words that aren't in our free dictionary
• Expanded definitions, etymologies, and usage notes
• Advanced search features
• Ad free!