Etymology
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mononucleosis (n.)

"infection disease characterized by an abnormally high proportion of mononuclear leucocytes in the blood," 1917, coined from mononuclear + Modern Latin -osis "abnormal condition."

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Definitions of mononucleosis

mononucleosis (n.)
an acute disease characterized by fever and swollen lymph nodes and an abnormal increase of mononuclear leucocytes or monocytes in the bloodstream; not highly contagious; some believe it can be transmitted by kissing;
Synonyms: infectious mononucleosis / mono / glandular fever / kissing disease
From wordnet.princeton.edu