The Collaborative International Dictionary of English v.0.48:
Tzarina \Tza*ri"na\, Tzaritza \Tza*rit"za\, n. The empress of Russia. See Czarina. [1913 Webster]WordNet (r) 3.0 (2006):
tzarina n 1: the wife or widow of a czar [syn: czarina, tsarina, tzarina, czaritza, tsaritsa]