transgenic /tɹɑːnzˈdʒɛnɪk/adjective 1noun 1forms 1 adjective1 •Of, or pertaining to an organism whose genome has been changed by the addition of a gene from another species; (of an organism) whose genome has been changed by such addition, genetically modified.The third type are human transgenic embryos, made by injecting a segment of animal DNA into a human egg. — 2008 noun1 •An organism whose genome has been genetically modified. formstransgenics