Definition of mononucleosis noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˌmɒnəʊˌnjuːkliˈəʊsɪs//
; NAmE NAmE//ˌmɑːnoʊˌnuːkliˈoʊsɪs//
(North American English or British English, medical) (North American English, informal mono) (British English glandular fever) [uncountable]
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an infectious disease that causes swelling of the lymph glands and makes the person feel very weak for a long time
See the Oxford Advanced American Dictionary entry: mononucleosis