Source : Webster's Revised Unabridged Dictionary (1913)

Hookah \Hook"ah\ (h[oo^]k"[.a]), n. [Per. or Ar. huqqa a round
   box or casket, a bottle through which the fumes pass when
   smoking tobacco.]
   A pipe with a long, flexible stem, so arranged that the smoke
   is cooled by being made to pass through water.

Source : WordNet®

hookah
     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: {narghile},
          {nargileh}, {sheesha}, {shisha}, {chicha}, {calean}, {kalian},
          {water pipe}, {hubble-bubble}, {hubbly-bubbly}]