The Collaborative International Dictionary of English v.0.48:

Prophetize \Proph"et*ize\, v. i. [L. prophetizare, Gr. ?: cf. F.
   proph['e]tiser. Cf. Prophesy.]
   To give predictions; to foreshow events; to prophesy. [R.]
   "Prophetizing dreams." --Daniel.
   [1913 Webster]