The Collaborative International Dictionary of English v.0.48:
Sectarist \Sec"ta*rist\, n. A sectary. [R.] --T. Warton. [1913 Webster]WordNet (r) 3.0 (2006):
sectarist n 1: a member of a sect; "most sectarians are intolerant of the views of any other sect" [syn: sectarian, sectary, sectarist]