EPISTASIS Meaning of EPISTASIS in English [ ɪ'pɪstəsɪs ]■ noun Genetics the suppression by a gene of the effect of another gene.Derivativesepistatic ˌɛpɪ'statɪk adjective OriginC19: from Gk, lit. 'stoppage'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004