/ˌɒpətju:ˈnɪstɪk ||; ˌɑpɚtuˈnɪstɪk/adj1 =OPPORTUNIST
2 (only before a noun 只用于名词前) (medical医学) harmful to people whose IMMUNE SYSTEM (= the system in your body that produces substances to help it fight against infection or disease) has been made weak by disease or drugs 机会性的,机遇性的(对因患病或吸毒而免疫系统减弱的人有害): an opportunistic infection 机遇性感染