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English definition of “mononucleosis”

mononucleosis

noun [U]     /ˌmɒn.əʊˌnjuː.kliˈəʊ.sɪs/ US  /ˌmɑː.noʊˌnuː.kliˈoʊ-/ (informal mono)
mainly US for glandular fever (= an infectious disease that makes you feel weak and ill for a long time )Fevers and infectious diseasesColds and flu
(Definition of mononucleosis noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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