The Collaborative International Dictionary of English v.0.48:

Intercross \In`ter*cross"\ (?; 115), v. t. & i. [imp. & p. p.
   Intercrossed; p. pr. & vb. n. Intercrossing.]
   [1913 Webster]
   1. To cross each other, as lines.
      [1913 Webster]

   2. (Biol.) To fertilize by the impregnation of one species or
      variety by another; to impregnate by a different species
      or variety.
      [1913 Webster]