Medical Definition of vestibule
: any of various bodily cavities especially when serving as or resembling an entrance to some other cavity or space: asa: the central cavity of the bony labyrinth of the ear: 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
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