oncogenicPronunciation: /ˌɒŋkə(ʊ)ˈdʒɛnɪk/Definition of oncogenic adjective Medicine causing development of a tumour or tumours. Derivatives oncogenesis noun oncogenicityPronunciation: /-ˈnɪsɪti/ noun oncogenic in other Oxford dictionaries Definition of oncogenic in the US English dictionary