microcellular Syllabification: (mi·cro·cel·lu·lar)Pronunciation: /ˌmīkrōˈselyələr/Definition of microcellular adjective containing or made up of minute cells. (of a mobile telephone system) having small cells, typically with a radius of less than half a mile. microcellular in other Oxford dictionaries Definition of microcellular in the British & World English dictionary