epigenetic Syllabification: (ep·i·ge·net·ic)Pronunciation: /ˌepijəˈnetik/Definition of epigenetic adjective Biology relating to or arising from nongenetic influences on gene expression:epigenetic carcinogens Biology of, relating to, or of the nature of epigenesis. Geology formed later than the surrounding or underlying rock formation. Derivatives epigeneticallyPronunciation: /-(ə)lē/ adverb epigeneticistPronunciation: /-ˈnetisist/ noun epigenetic in other Oxford dictionaries Definition of epigenetic in the British & World English dictionary