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

 

mononucleosis

 noun
noun
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