vestibulum

[ vĕ-stĭbyə-ləm ]

n. pl. ves•tib•u•la (-lə)

A cavity, chamber, or channel; vestibule.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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