| Noun | 1. | vestibule - a large entrance or reception room or areabuilding, edifice - a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice" narthex - a vestibule leading to the nave of a church room - an area within a building enclosed by walls and floor and ceiling; "the rooms were very small but they had a nice view" |
| 2. | vestibule - any of various bodily cavities leading to another cavity (as of the ear or vagina)vestibule of the ear - the central cavity of the bony labyrinth of the ear |