Pronunciation: (ves'tu-byOOl"), [key]
—n., v., -buled, -bul•ing.
1. a passage, hall, or antechamber between the outer door and the interior parts of a house or building.
2. Railroads.an enclosed space at the end of a passenger car, serving as a sheltered entrance to the car from another car or from outside the train.
3. Anat., Zool.any of various cavities or hollows regarded as forming an approach or entrance to another cavity or space, as that of the internal ear. See diag. under ear.
to provide with a vestibule.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.