introitus

Medical Dictionary

introitus in·tro·i·tus (ĭn-trō'ĭ-təs)
n. pl. introitus
The entrance into a canal or hollow organ, such as the vagina.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
introitus

noun
entrance or opening to a hollow organ or tube (especially the vaginal opening); "the introitus of the vagina" 
WordNet® 3.0, © 2006 by Princeton University.
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