From Longman Dictionary of Contemporary Englishmononucleosismon‧o‧nu‧cle‧o‧sis /ˌmɒnəʊnjuːkliˈəʊsɪs $ ˌmɑːnoʊnuːkliˈoʊ-/ noun [uncountable] medical MImono1(1)
Examples from the Corpus
mononucleosis• He cast Alvin as a sacrificial fowl-carrier instead, but Alvin pulled out altogether when he became sick with mononucleosis.Origin mononucleosis (1900-2000) mono- + nucleus + -osis 