Definitions for backcrossˈbækˌkrɔs, -ˌkrɒs
Random House Webster's College Dictionary
to cross (a hybrid of the first generation) with either of its parents.
(n.)an instance of such crossing.
Origin of backcross:
mate a hybrid of the first generation with one of its parents
The act of such a crossing
An individual produced by such a crossing
To cross a hybrid with one of its parents