Definition of mononucleosis noun from the Oxford Advanced American Dictionary

 

mononucleosis

 noun
noun
NAmE//ˌmɑnoʊˌnukliˈoʊsəs//
 
(informal mono)[uncountable](medical)
 
jump to other results
an infectious disease that causes swelling of the lymph nodes and makes the person feel very weak for a long time
See the Oxford Advanced Learner's Dictionary entry: mononucleosis