Source : Webster's Revised Unabridged Dictionary (1913)

Zikkurat \Zik"ku*rat\, n.
   A temple tower of the Babylonians or Assyrians, consisting of
   a lofty pyramidal structure, built in successive stages, with
   outside staircases, and a shrine at the top.

Source : WordNet®

zikkurat
     n : a rectangular tiered temple or terraced mound erected by the
         ancient Assyrians and Babylonians [syn: {ziggurat}, {zikurat}]