Webster's English Dictionary

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vestibule

ves.ti.bule \'ves-t*-.byu:(*)l\ n [L vestibulum] 1a: a passage, hall, or 
   room between the outer door and the interior of a b uilding : LOBBY 1b: an 
   enclosed entrance at the end of a railway passenger car  2: any of various 
   bodily cavities esp. when serving as or resembling an ent rance to some 
   other cavity or space : as 2a: the central cavity of the bony labyrinth of 
   the ear or the parts of the  membranous labyrinth that it contains 2b: the 
   part of the left ventricle below the aortic orifice