tsar

from WordNet (r) 3.0 (2006)

tsar
    n 1: a male monarch or emperor (especially of Russia prior to
         1917) [syn: {czar}, {tsar}, {tzar}]

from The Collaborative International Dictionary of English v.0.48

Tsar \Tsar\, n.
   The title of the emperor of Russia. See {Czar}.
   [1913 Webster] Tsarina

from The Collaborative International Dictionary of English v.0.48

czar \czar\ (z[aum]r), n. [Russ. tsare, fr. L. Caesar C[ae]sar;
   cf. OPol. czar, Pol. car. ]
   A king; a chief; the title of the emperor of Russia. [Written
   also {tsar} and {tzar}.]
   [1913 Webster]

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