Whis·per·ing, a. & n. from Whisper. v. t.
  Whispering gallery, or Whispering dome, one of such a form that sounds produced in certain parts of it are concentrated by reflection from the walls to another part, so that whispers or feeble sounds are audible at a much greater distance than under ordinary circumstances.  The dome of the U. S. capitol building is one example.
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  whispering dome
       n : a space beneath a dome or arch in which sounds produced at
           certain points are clearly audible at certain distant
           points [syn: whispering gallery]