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.