Source : Webster's Revised Unabridged Dictionary (1913)

Soothsayer \Sooth"say`er\, n.
   1. One who foretells events by the art of soothsaying; a
      prognosticator.

   2. (Zo["o]l.) A mantis.

Source : WordNet®

soothsayer
     n : someone who makes predictions of the future (usually on the
         basis of special knowledge) [syn: {forecaster}, {predictor},
          {prognosticator}]