monotheist

from WordNet (r) 3.0 (2006)

monotheist
    n 1: a believer in one god

from The Collaborative International Dictionary of English v.0.48

Monotheist \Mon"o*the*ist\, n. [Cf. F. monoth['e]iste.]
   One who believes that there is but one God.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

21 Moby Thesaurus words for "monotheist":
      allotheist, anthropolater, anthropotheist, autotheist, cosmotheist,
      deist, ditheist, dualist, henotheist, hylotheist, multitheist,
      myriotheist, pantheist, physitheist, polytheist, psychotheist,
      tetratheist, theist, theriotheist, tritheist, zootheist

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