Source : Webster's Revised Unabridged Dictionary (1913)

Particularist \Par*tic"u*lar*ist\, n. [Cf. F. particulariste.]
   One who holds to particularism. -- {Par*tic`u*lar*is"tic}, a.

Source : WordNet®

particularistic
     adj : relating to particularism (exclusive interest in one group
           or class or sect etc.); "a particularistic-seeming
           statement"