poikiloblastic Syllabification: (poi·kil·o·blas·tic)Pronunciation: /ˌpoiˌkēləˈblastik, -ˌkil-/Definition of poikiloblastic adjective Geology relating to or denoting the texture of a metamorphic rock in which small crystals of an original mineral occur within crystals of its metamorphic product. poikiloblastic in other Oxford dictionaries Definition of poikiloblastic in the British & World English dictionary