dualist

from WordNet (r) 3.0 (2006)

dualist
    n 1: an adherent of dualism

from The Collaborative International Dictionary of English v.0.48

Dualist \Du"al*ist\, n. [Cf. F. dualiste.]
   1. One who believes in dualism; a ditheist.
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   2. One who administers two offices. -- Fuller.
      [1913 Webster]