Medical Dictionary


noun ves·ti·bule \ˈves-tə-ˌbyül\

Medical Definition of VESTIBULE

:  any of various bodily cavities especially when serving as or resembling an entrance to some other cavity or space: as a (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 labyrinth b :  the space between the labia minora containing the orifice of the urethra c :  the part of the left ventricle of the heart immediately below the aortic orifice d :  the part of the mouth cavity outside the teeth and gums
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