MONONUCLEOSIS Meaning of MONONUCLEOSIS in English mononucleosis BrE AmE ˌmɒn əʊ ˌnjuːk li ˈəʊs ɪs § -ˌnuːk-, § -əs AmE \ ˌmɑːn oʊ ˌnuːk li ˈoʊs əs -ˌnjuːk- Longman Pronunciation English Dictionary. Английский словарь произношений Longman. 2012