The Collaborative International Dictionary of English v.0.48:

Maiden \Maid"en\, a.
   1. Of or pertaining to a maiden, or to maidens; suitable to,
      or characteristic of, a virgin; as, maiden innocence.
      "Amid the maiden throng." --Addison.
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            Have you no modesty, no maiden shame ? --Shak.
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   2. Never having been married; not having had sexual
      intercourse; virgin; -- said usually of the woman, but
      sometimes of the man; as, a maiden aunt. "A surprising old
      maiden lady." --Thackeray.
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   3. Fresh; innocent; unpolluted; pure; hitherto unused.
      "Maiden flowers." --Shak.
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            Full bravely hast thou fleshed
            Thy maiden sword.                     --Shak.
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   4. Used of a fortress, signifying that it has never been
      captured, or violated. -- T. Warton. Macaulay.
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   Maiden assize (Eng. Law), an assize which there is no
      criminal prosecution; an assize which is unpolluted with
      blood. It was usual, at such an assize, for the sheriff to
      present the judge with a pair of white gloves. --Smart.

   Maiden name, the surname of a woman before her marriage.

   Maiden pink. (Bot.) See under Pink.

   Maiden plum (Bot.), a West Indian tree (Comocladia
      integrifolia) with purplish drupes. The sap of the tree
      is glutinous, and gives a persistent black stain.

   Maiden speech, the first speech made by a person, esp. by a
      new member in a public body.

   Maiden tower, the tower most capable of resisting an enemy.


   maiden voyage the first regular service voyage of a ship.
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WordNet (r) 3.0 (2006):

maiden name
    n 1: a woman's surname before marriage