v. t. & i.
n. (Agric.) A crop grown among or between the rows of another crop; a catch crop. [ Webster 1913 Suppl. ]
v. t. & i.
n. The process or result of cross fertilization between different kinds of animals, or different varieties of plants. [ 1913 Webster ]
We have reason to believe that occasional intercrosses take place with all animals and plants. Darwin. [ 1913 Webster ]