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.

Source: Webster's Revised Unabridged Dictionary (1913)