what is a hyman
Hymen: a thin membrane that surrounds the opening to the vagina. Hymens can come in different shapes. The most common hymen in young girls is shaped like a half moon. This shape allows menstrual blood to flow out of a girlâs vagina.ymen: a thin membrane that surrounds the opening to the vagina. Hymens can come in different shapes. The most common hymen in young girls is shaped like a half moon. This shape allows menstrual blood to flow out of a girlâs vagina.