Medical Definition of vestibule
: any of various bodily cavities especially when serving as or resembling an entrance to some other cavity or space: asa (1): the central cavity of the bony labyrinth of the ear (2): the parts of the membranous labyrinth comprising the utricle and the saccule and contained in the cavity of the bony labyrinthb: the space between the labia minora containing the orifice of the urethrac: the part of the left ventricle of the heart immediately below the aortic orificed: the part of the mouth cavity outside the teeth and gums
Seen and Heard
What made you want to look up vestibule? Please tell us where you read or heard it (including the quote, if possible).