vestibule
(noun) [VES·tah·byool']
1. a passage, hall, or room between the outer door and the interior of a building: "The cold wind howled through the beautiful but decaying vestibule."
2. an enclosed area at the entrance of a passenger car on a railroad train
3. (as in anatomy) any of various bodily cavities leading to another cavity (as of the ear or vagina)
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