The Collaborative International Dictionary of English v.0.48:

Hymen \Hy"men\, n. [Gr. "ymh`n skin, membrane.] (Anat.)
   A fold of muscous membrane often found at the orifice of the
   vagina in virgins; the vaginal membrane. It is usually torn
   by sexual intercourse.
   [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Hymen \Hy"men\, n. [L., fr. Gr. ?.]
   1. (Class Myth.) A fabulous deity; according to some, the son
      of Apollo and Urania, according to others, of Bacchus and
      Venus. He was the god of marriage, and presided over
      nuptial solemnities.
      [1913 Webster]

            Till Hymen brought his love-delighted hour,
            There dwelt no joy in Eden's rosy bower. --Campbell.
      [1913 Webster]

   2. Marriage; union as if by marriage.
      [1913 Webster]

            Hymen of element and race.            --Emerson.

WordNet (r) 3.0 (2006):

Hymen
    n 1: (Greek mythology) the god of marriage
    2: a fold of tissue that partly covers the entrance to the
       vagina of a virgin [syn: hymen, maidenhead, virginal
       membrane]