Source : Webster's Revised Unabridged Dictionary (1913)

Astrologer \As*trol"o*ger\, n. [See {Astrology}.]
   1. One who studies the stars; an astronomer. [Obs.]

   2. One who practices astrology; one who professes to foretell
      events by the aspects and situation of the stars.

Source : WordNet®

astrologer
     n : someone who predicts the future by the positions of the
         planets and sun and moon [syn: {astrologist}]