The Collaborative International Dictionary of English v.0.48:

Misanthropist \Mis*an"thro*pist\, n.
   A misanthrope.
   [1913 Webster]

WordNet (r) 3.0 (2006):

misanthropist
    n 1: someone who dislikes people in general [syn: misanthrope,
         misanthropist]