Definitions from Wiktionary (vestibule)

▸ noun:  (architecture) A small entrance hall, antechamber, passage, or room between the outer door and the main hall, lobby, or interior of a building.
▸ noun:  (architecture) A large entrance hall in a temple or palace.
▸ noun:  (rail transport) An enclosed entrance at the end of a railway passenger car.
▸ noun:  (anatomy) Any of a number of body cavities or channels, serving as or resembling an entrance to another bodily space.
▸ noun:  The central cavity of the bony labyrinth of the inner ear or the parts (such as the saccule and utricle) of the membranous labyrinth that it contains.
▸ noun:  The part of the left ventricle below the aortic orifice.
▸ noun:  The part of the mouth outside the teeth and gums.
▸ verb:  (transitive) To furnish with a vestibule or vestibules.
▸ noun:  Clipping of vulval vestibule: the space in the vulva between the labia minora and into which both the urethra and vagina open. [(anatomy) The part of the vulva between the labia minora containing the openings of the vagina and urethra.]

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