umbilicate Syllabification: (um·bil·i·cate)Pronunciation: /ˌəmˈbilikit, -ˌkāt/Definition of umbilicate adjective Botany & Zoology (especially of the cap of a fungus) having a central depression. (of a shell) having an umbilicus. umbilicate in other Oxford dictionaries Definition of umbilicate in the British & World English dictionary