The Collaborative International Dictionary of English v.0.48:

Moralize \Mor"al*ize\, v. i.
   1. To make moral reflections; to regard acts and events as
      involving a moral.
      [1913 Webster]

   2. to lecture to a person in a manner asserting moral
      principles.

   Syn: sermonize, preachify, moralise.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Moralize \Mor"al*ize\ (m[o^]r"al*[imac]z), v. t. [imp. & p. p.
   Moralized (m[o^]r"al*[imac]zd); p. pr. & vb. n.
   Moralizing (m[o^]r"al*[imac]*z[i^]ng).] [Cf. F. moraliser.]
   1. To apply to a moral purpose; to explain in a moral sense;
      to draw a moral from.
      [1913 Webster]

            This fable is moralized in a common proverb.
                                                  --L'Estrange.
      [1913 Webster]

            Did he not moralize this spectacle?   --Shak.
      [1913 Webster]

   2. To furnish with moral lessons, teachings, or examples; to
      lend a moral to.
      [1913 Webster]

            While chastening thoughts of sweetest use, bestowed
            By Wisdom, moralize his pensive road. --Wordsworth.
      [1913 Webster]

   3. To render moral; to correct the morals of.
      [1913 Webster]

            It had a large share in moralizing the poor white
            people of the country.                --D. Ramsay.
      [1913 Webster]

   4. To give a moral quality to; to affect the moral quality
      of, either for better or worse.
      [1913 Webster]

            Good and bad stars moralize not our actions. --Sir
                                                  T. Browne.
      [1913 Webster]

WordNet (r) 3.0 (2006):

moralize
    v 1: interpret the moral meaning of; "moralize a story" [syn:
         moralize, moralise]
    2: speak as if delivering a sermon; express moral judgements;
       "This man always sermonizes" [syn: sermonize, sermonise,
       preachify, moralize, moralise]
    3: improve the morals of [syn: moralize, moralise]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "moralize":
   annotate, censure, criticize, critique, discourse, explain,
   exposit, expound, harangue, hold forth, lecture, moralize upon,
   point a moral, pontificate, preach, preachify, read a lesson,
   review, sermonize