from
The Collaborative International Dictionary of English v.0.48
Dualistic \Du`al*is"tic\, a.
Consisting of two; pertaining to dualism or duality.
[1913 Webster]
{Dualistic system} or {Dualistic theory} (Chem.), an old
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chemical or electrical affinities; -- superseded by later
developments in chemical bonding theory, especially
quantum mechanics.
[1913 Webster +PJC]