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TAKE THE QUIZmononucleosis
noun
mono·nu·cle·o·sis
ˌmä-nə-ˌnü-klē-ˈō-səs
-ˌnyü-
: an abnormal increase of mononuclear white blood cells in the blood
specifically
: infectious mononucleosis
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Merriam-Webster unabridged
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