Source : Webster's Revised Unabridged Dictionary (1913)

Maidenhead \Maid"en*head\, n. [See {Maidenhood}.]
   1. The state of being a maiden; maidenhood; virginity.
      --Shak.

   2. The state of being unused or uncontaminated; freshness;
      purity. [Obs.]

            The maidenhead of their credit.       --Sir H.
                                                  Wotton.

   3. The hymen, or virginal membrane.

Source : WordNet®

maidenhead
     n : a fold of tissue that partly covers the entrance to the
         vagina of a virgin [syn: {hymen}, {virginal membrane}]