The Collaborative International Dictionary of English v.0.48:

Satirist \Sat"ir*ist\, n. [Cf. F. satiriste.]
   One who satirizes; especially, one who writes satire.
   [1913 Webster]

         The mighty satirist, who . . . had spread terror
         through the Whig ranks.                  --Macaulay.
   [1913 Webster]

WordNet (r) 3.0 (2006):

satirist
    n 1: a humorist who uses ridicule and irony and sarcasm [syn:
         satirist, ironist, ridiculer]