allogenic Syllabification: (al·lo·gen·ic)Pronunciation: /ˌaləˈjenik/Definition of allogenic adjective 1 Geology (of a mineral or sediment) transported to its present position from elsewhere. Often contrasted with authigenic. 2 Ecology (of a successional change) caused by nonliving factors in the environment. allogenic in other Oxford dictionaries Definition of allogenic in the British & World English dictionary