Source : Webster's Revised Unabridged Dictionary (1913)

Dualistic \Du`al*is"tic\, a.
   Consisting of two; pertaining to dualism or duality.

   {Dualistic} {system or theory} (Chem.), the theory,
      originated by Lavoisier and developed by Berzelius, that
      all definite compounds are binary in their nature, and
      consist of two distinct constituents, themselves simple or
      complex, and possessed of opposite chemical or electrical
      affinities.