introgression

[ in-truh-gresh-uhn ]
/ ˌɪn trəˈgrɛʃ ən /

noun Genetics.

the introduction of genes from one species into the gene pool of another species, occurring when matings between the two produce fertile hybrids.
Also called in·tro·gres·sive hybridiza·tion [in-truh-gres-iv]. /ˌɪn trəˈgrɛs ɪv/.

Origin of introgression

First recorded in 1930–35 (earlier in literal sense of Latin ); from Latin intrōgress(us) past participle of intrōgredī “to go in, enter” (intrō- “within, inward” + -gred-, combining form of grad(ī) “to proceed, walk” + -tus past participle suffix, with -dt- becoming -ss- ); see -ion,intro-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for introgression

introgression
/ (ˌɪntrəˈɡrɛʃən) /

noun

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