The Collaborative International Dictionary of English v.0.48:

Bagpipe \Bag"pipe\, n.
   A musical wind instrument, now used chiefly in the Highlands
   of Scotland.
   [1913 Webster]

   Note: It consists of a leather bag, which receives the air by
         a tube that is stopped by a valve; and three sounding
         pipes, into which the air is pressed by the performer.
         Two of these pipes produce fixed tones, namely, the
         bass, or key tone, and its fifth, and form together
         what is called the drone; the third, or chanter, gives
         the melody.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Bagpipe \Bag"pipe\, v. t.
   To make to look like a bagpipe.
   [1913 Webster]

   To bagpipe the mizzen (Naut.), to lay it aback by bringing
      the sheet to the mizzen rigging. --Totten.
      [1913 Webster]

WordNet (r) 3.0 (2006):

bagpipe
    n 1: a tubular wind instrument; the player blows air into a bag
         and squeezes it out through the drone