amebiasis Syllabification: (am·e·bi·a·sis)Pronunciation: /ˌaməˈbīəsis/ (also amoebiasis)Definition of amebiasis noun Medicine infection with amebas, especially as causing dysentery. Origin: early 20th century: from ameba + -asisamebiasis in other Oxford dictionaries Definition of amebiasis in the British & World English dictionary