mononucleosis

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mononucleosis /ˌmɑːnəˌnuːkliˈoʊsəs/ Brit /ˌmɒnəˌnjuːkliˈəʊsəs/ noun
mononucleosis
/ˌmɑːnəˌnuːkliˈoʊsəs/ Brit /ˌmɒnəˌnjuːkliˈəʊsəs/
noun
Learner's definition of MONONUCLEOSIS
[noncount] medical
: a disease that makes people very tired and weak for a long time
called also (British) glandular fever, (informal) mono