opsonize Syllabification: (op·so·nize)Pronunciation: /ˈäpsəˌnīz/Definition of opsonize verb [with object] Medicine make (a foreign cell) more susceptible to phagocytosis. Derivatives opsonizationPronunciation: /ˌäpsəˌniˈzāSHən/ noun opsonize in other Oxford dictionaries Definition of opsonize in the British & World English dictionary