hymen
thin vaginal membrane
Today this word meansThe thin fold of mucous membrane around the vaginal opening.
Greek hymēn was a common noun meaning "membrane."
Some hold that it branched from the same word as Hymenaeus, god of marriage; others, that the forms merely coincide. Both views stand.
Worth noting
The notion that an "intact" membrane reveals sexual history has no medical basis. The trend is to move away from the term altogether.