Home › Words › O › ontogenyontogeny/ɒnˈtɒdʒəni/ontogeny · noun — synonym of ontogenesis.Definition from Wiktionary (CC BY-SA 3.0).ontogeny is pronounced /ɒnˈtɒdʒəni/.EtymologyFrom onto- + -geny, after German Ontogenie.nounSynonym of ontogenesis.Definitions & examples from Wiktionary (CC BY-SA 3.0).