n :  any of various bodily cavities esp. 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 .
 
 
 
Similar sounding terms:  vestibula  vestibuli 
 
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