/ Dictionary / Index B backcross: Meaning and Definition of Find definitions for: back•cross Pronunciation: (bak'krôs", -kros"), [key] — Genetics. Genetics. —v.t. to cross (a hybrid of the first generation) with either of its parents. —n. an instance of such crossing. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: backcross (Thesaurus) backcourtman backdate Related Content Daily Word Quiz: ounterfeit Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language