Source : Webster's Revised Unabridged Dictionary (1913)

Prologize \Pro"lo*gize\, v. i. [Gr. ?. See {Prologue}.]
   To deliver a Prologue. [R.] --Whewell.

Source : WordNet®

prologize
     v : write or speak a prologue [syn: {prologuize}, {prologise}]