Source : Webster's Revised Unabridged Dictionary (1913)

Sermonize \Ser"mon*ize\, v. i. [imp. & p. p. {Sermonized}; p.
   pr. & vb. n. {Sermonizing}.]
   1. To compose or write a sermon or sermons; to preach.

   2. To inculcate rigid rules. [R.] --Chesterfield.

Sermonize \Ser"mon*ize\, v. t.
   To preach or discourse to; to affect or influence by means of
   a sermon or of sermons. [R.]

         Which of us shall sing or sermonize the other fast
         asleep?                                  --Landor.

Source : WordNet®

sermonize
     v : speak as if delivering a sermon; express moral judgements;
         "This man always sermonizes" [syn: {sermonise}, {preachify},
          {moralize}, {moralise}]