Source : Webster's Revised Unabridged Dictionary (1913)

Water pipe \Wa"ter pipe\
   A pipe for conveying water.

Source : WordNet®

water pipe
     n : an oriental tobacco pipe with a long flexible tube connected
         to a container where the smoke is cooled by passing
         through water; "a bipolar world with the hookah and
         Turkish coffee versus hamburgers and Coca Cola" [syn: {hookah},
          {narghile}, {nargileh}, {sheesha}, {shisha}, {chicha}, {calean},
          {kalian}, {hubble-bubble}, {hubbly-bubbly}]