Source : Webster's Revised Unabridged Dictionary (1913)

Cross-fertilize \Cross"-fer"ti*lize\, v. t. [imp. & p. p.
   {Cross-fertilized}; p. pr. & vb. n. {Cross-fertilizing}.]
   (Bot.)
   To fertilize, as the stigmas of a flower or plant, with the
   pollen from another individual of the same species.

Source : WordNet®

cross-fertilize
     v 1: undergo cross-fertilization; become fertile [syn: {cross-fertilise}]
     2: cause to undergo cross-fertilization; "Mendel
        cross-fertilized different kinds of beans" [syn: {cross-fertilise}]