vestibule

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Related to aortic vestibule: aortic orifice

vestibule

any small bodily cavity or space at the entrance to a passage or canal
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

Vestibule

An intermediate chamber or passage located between the entrance and interior of a building that serves as a shelter or transitional element from exterior to interior space.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

vestibule

[′ves·tə‚byül]
(anatomy)
The central cavity of the bony labyrinth of the ear.
The parts of the membranous labyrinth within the cavity of the bony labyrinth.
The space between the labia minora.
(building construction)
A hall or chamber between the outer door and the interior, or rooms, of a building.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

vestibule

An anteroom or small foyer leading into a larger space.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.