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The Collaborative International Dictionary
kissing disease

kissing disease \kiss"ing dis*ease"\ Infectious mononucleosis; -- so called because often spread by kissing.

Wiktionary
kissing disease

n. (context informal English) nickname for mononucleosis.

WordNet
kissing disease

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 [syn: infectious mononucleosis, mononucleosis, mono, glandular fever]