The Collaborative International Dictionary of English v.0.48:

Bar \Bar\ (b[aum]r), v. t. [imp. & p. p. Barred (b[aum]rd); p.
   pr. & vb. n. Barring.] [ F. barrer. See Bar, n.]
   1. To fasten with a bar; as, to bar a door or gate.
      [1913 Webster]

   2. To restrict or confine, as if by a bar; to hinder; to
      obstruct; to prevent; to prohibit; as, to bar the entrance
      of evil; distance bars our intercourse; the statute bars
      my right; the right is barred by time; a release bars the
      plaintiff's recovery; -- sometimes with up.
      [1913 Webster]

            He barely looked the idea in the face, and hastened
            to bar it in its dungeon.             --Hawthorne.
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   3. To except; to exclude by exception.
      [1913 Webster]

            Nay, but I bar to-night: you shall not gauge me
            By what we do to-night.               --Shak.
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   4. To cross with one or more stripes or lines.
      [1913 Webster]

            For the sake of distinguishing the feet more
            clearly, I have barred them singly.   --Burney.
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WordNet (r) 3.0 (2006):

barred
    adj 1: preventing entry or exit or a course of action; "a
           barricaded street"; "barred doors"; "the blockaded
           harbor" [syn: barricaded, barred, blockaded]
    2: marked with stripes or bands