The Collaborative International Dictionary of English v.0.48:

Pipe \Pipe\, v. t. [imp. & p. p. Piped; p. pr. & vb. n.
   Piping.]
   1. To perform, as a tune, by playing on a pipe, flute, fife,
      etc.; to utter in the shrill tone of a pipe.
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            A robin . . . was piping a few querulous notes. --W.
                                                  Irving.
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   2. (Naut.) To call or direct, as a crew, by the boatswain's
      whistle.
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            As fine a ship's company as was ever piped aloft.
                                                  --Marryat.
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   3. To furnish or equip with pipes; as, to pipe an engine, or
      a building.
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The Collaborative International Dictionary of English v.0.48:

Piped \Piped\, a.
   Formed with a pipe; having pipe or pipes; tubular.
   [1913 Webster]