Pronunciation: (klēr'stôr"ē, -stōr"ē), [key]
1. Archit.a portion of an interior rising above adjacent rooftops and having windows admitting daylight to the interior.
2. a raised construction, as on the roof of a railroad car, having windows or slits for admitting light or air. Also,clearstory.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.