Introitus
An introitus is an entrance into a canal or hollow organ. The vaginal introitus is the opening that leads to the vaginal canal.[1]
References
    
-  John H. Dirckx (editor) (1997). Stedman's Concise Medical and Allied Health Dictionary (3rd ed.). Williams and Wilkins. p. 451. ISBN 0-683-23125-1. {{cite encyclopedia}}:|author=has generic name (help)
External links
    
 The dictionary definition of introitus at Wiktionary The dictionary definition of introitus at Wiktionary
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