This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. To cross (a hybrid) with one of its parents or with an individual genetically identical to one of its parents.

n. The act of making such a cross.

n. An individual resulting from such a cross.

v. To cross a hybrid with one of its parents

n. The act of such a crossing

n. An individual produced by such a crossing

n. Alternative form of back cross.

v. mate a hybrid of the first generation with one of its parents

"Genome-wide and additional fine mapping of backcross mice, derived from C3H"

hybridize    hybridise    interbreed    crossbreed    cross   

chubby-faced    pronucleus    under-performance    erring    drak'il