Source : Webster's Revised Unabridged Dictionary (1913)

Bastardize \Bas"tard*ize\, v. t. [imp. & p. p. {Bastardized}
   (?); p. pr. & vb. n. {Bastardizing}.]
   1. To make or prove to be a bastard; to stigmatize as a
      bastard; to declare or decide legally to be illegitimate.

            The law is so indulgent as not to bastardize the
            child, if born, though not begotten, in lawful
            wedlock.                              --Blackstone.

   2. To beget out of wedlock. [R.] --Shak.

Source : WordNet®

bastardize
     v 1: change something so that its value declines; for example,
          art forms [syn: {bastardise}]
     2: declare a child to be illegitimate [syn: {bastardise}]