Source : Webster's Revised Unabridged Dictionary (1913)

Sectarist \Sec"ta*rist\, n.
   A sectary. [R.] --T. Warton.

Source : WordNet®

sectarist
     n : a member of a sect; "most sectarians are intolerant of the
         views of any other sect" [syn: {sectarian}, {sectary}]