Source : Webster's Revised Unabridged Dictionary (1913)

Denaturalize \De*nat"u*ral*ize\ (?; 135), v. t. [imp. & p. p.
   {Denaturalized}; p. pr. & vb. n. {Denaturalizing}.] [Cf. F.
   d['e]naturaliser.]
   1. To render unnatural; to alienate from nature.

   2. To renounce the natural rights and duties of; to deprive
      of citizenship; to denationalize. [R.]

            They also claimed the privilege, when aggrieved, of
            denaturalizing themselves, or, in other words, of
            publicly renouncing their allegiance to their
            sovereign, and of enlisting under the banners of his
            enemy.                                --Prescott.