The Collaborative International Dictionary of English v.0.48:

Czarowitz \Czar"o*witz\ (z?r"?-w?ts or t??r"?-v?ch), n.; pl.
   Czarowitzes (-?z). [Russ. tsar['e]vich'.]
   The title of the eldest son of the czar of Russia.
   [1913 Webster]