The Collaborative International Dictionary of English v.0.48:

Prejudge \Pre*judge"\, v. t. [imp. & p. p. Prejudged; p. pr. &
   vb. n. Prejudging.] [Pref. pre + judge: cf. F. pr['e]juger.
   Cf. Prejudicate, Prejudice.]
   To judge before hearing, or before full and sufficient
   examination; to decide or sentence by anticipation; to
   condemn beforehand.
   [1913 Webster]

         The committee of council hath prejudged the whole case,
         by calling the united sense of both houses of
         Parliament" a universal clamor."         --Swift.
   [1913 Webster]

WordNet (r) 3.0 (2006):

prejudge
    v 1: judge beforehand, especially without sufficient evidence