from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A vertical shaft around which a staircase has been built.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A shaft in a multi-story building enclosing a stairway or staircase.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a vertical well around which there is a stairway


From stair + well (a reference to the shaft's usual shape). (Wiktionary)



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