wellhole

  1. Noun.  The open space in a floor, to accommodate a staircase.
  2. Noun.  The open space left beyond the ends of the steps of a staircase.
  3. Noun.  A cavity which receives a counterbalancing weight in certain mechanical contrivances, and is adapted also for other purposes.

This is an unmodified, but possibly outdated, definition from Wiktionary and used here under the Creative Commons license. Wiktionary is a great resource. If you like it too, please donate to Wikimedia.

This entry was last updated on RefTopia from its source on 3/20/2012.