Source : Webster's Revised Unabridged Dictionary (1913)

Hybridize \Hy"brid*i`ze\, v. t. [imp. & p. p. {Hybridized}; p.
   pr. & vb. n. {Hybridizing}.]
   To render hybrid; to produce by mixture of stocks.

Source : WordNet®

hybridizing
     n : (genetics) the act of mixing different species or varieties
         of animals or plants and thus to produce hybrids [syn: {hybridization},
          {hybridisation}, {crossbreeding}, {crossing}, {cross}, {interbreeding}]