Source : Webster's Revised Unabridged Dictionary (1913)

Tatta \Tat"ta\, n. [Hind. ?a??[=i], t[=a]t[=i].]
   A bamboo frame or trellis hung at a door or window of a
   house, over which water is suffered to trickle, in order to
   moisten and cool the air as it enters. [India]