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