hymen Syllabification: (hy·men)Pronunciation: /ˈhīmən/Definition of hymen noun a membrane that partially closes the opening of the vagina and whose presence is traditionally taken to be a mark of virginity. Derivatives hymenalPronunciation: /ˈhīmənl/ adjective Origin: mid 16th century: via late Latin from Greek humēn 'membrane'hymen in other Oxford dictionaries Definition of hymen in the British & World English dictionary