[in-truh-gresh-uh n]
noun Genetics.
  1. the introduction of genes from one species into the gene pool of another species, occurring when matings between the two produce fertile hybrids.

Origin of introgression

1930–35 (earlier in literal sense of L); < Latin intrōgress(us), past participle of intrōgredī to go in, enter (intrō- intro- + -gred-, combining form of grad(ī) to proceed, walk + -tus past participle suffix, with -dt- > -ss-) + -ion
Also called in·tro·gres·sive hybridiza·tion [in-truh-gres-iv] /ˌɪn trəˈgrɛs ɪv/. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for introgressive-hybridization


  1. the introduction of genes from the gene pool of one species into that of another during hybridization
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012