mononucleosis

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

Examples of mononucleosis in a Sentence

Recent Examples on the Web

Schaefer’s start to his 2024-25 OHL season was delayed until late October due to a bout with mononucleosis. —Carol Schram, Forbes, 14 Jan. 2025

Risk factors include having low vitamin D levels, smoking cigarettes, and having Epstein-Barr virus (EBV), which causes mononucleosis (mono). —Brandi Jones, Msn-Ed, Rn-Bc, Health, 24 Sep. 2024

Smith missed five games in the middle of his rookie season with mononucleosis. —Brad Biggs, Chicago Tribune, 18 Aug. 2024

Jones overcame a bout with mononucleosis six months ago, an illness that threatened to ruin his Olympic plans. —Joseph Dycus, The Mercury News, 1 Aug. 2024

Word History

Etymology

New Latin, from International Scientific Vocabulary mononuclear + New Latin -osis

First Known Use

1902, in the meaning defined above

Phrases Containing mononucleosis

• infectious mononucleosis

Medical Definition

mononucleosis

noun

mono·​nu·​cle·​o·​sis -ˌn(y)ü-klē-ˈō-səs 

: an abnormal increase of mononuclear white blood cells in the blood

specifically : infectious mononucleosis