Source : Webster's Revised Unabridged Dictionary (1913)

Intercross \In`ter*cross"\ (?; 115), v. t. & i. [imp. & p. p.
   {Intercrossed}; p. pr. & vb. n. {Intercrossing}.]
   1. To cross each other, as lines.

   2. (Biol.) To fertilize by the impregnation of one species or
      variety by another; to impregnate by a different species
      or variety.