mononucleosis

American  

[mon-uh-noo-klee-oh-sis, -nyoo-] / ˌmɒn əˌnu kliˈoʊ sɪs, -ˌnju- /

noun

Pathology.

1. the presence of an abnormally large number of mononuclear leukocytes, or monocytes, in the blood.

2. infectious mononucleosis.

---

mononucleosis British  

/ ˌmɒnəʊˌnjuːklɪˈəʊsɪs /

noun

1. pathol the presence of a large number of monocytes in the blood

2. See infectious mononucleosis

---

mononucleosis Scientific  

/ mŏn′ō-no̅o̅′klē-ō′sĭs /

1. A common infectious disease usually affecting young people, caused by the Epstein-Barr virus and characterized by fever, sore throat, swollen lymph nodes, and fatigue. The symptoms may last for several weeks.

---

mononucleosis Cultural  

1. An acute and infectious disease caused by a virus; its symptoms include fever, swelling of the lymph nodes, and general exhaustion. Mononucleosis gets its name from the kind of white blood cell (monocyte) that increases in number in the blood of persons who have the disease. There is no specific treatment, but sufferers usually recover within a few weeks.

---

Discover More

Mononucleosis is sometimes called the “kissing disease,” because at one time the virus was thought to be transmitted by kissing. The virus can be found in the saliva of those who have the disease, so there may be some truth in the belief.

Etymology

Origin of mononucleosis

First recorded in 1915–20; mononucle(ar) + -osis

Example Sentences

See Examples For:

mononucleosis

The vaccine that Vaccine Company is developing could protect against mononucleosis and potentially reduce long-term risk of multiple sclerosis, Skovronsky said.

From The Wall Street Journal ● May 26, 2026

Punter Ethan Evans returned to practice after sitting out against the Seahawks because of what he described as mononucleosis.

From Los Angeles Times ● Nov. 8, 2024

Knipe says he became interested in the biology of herpesviruses as an undergraduate while recovering from a bout of mononucleosis.

From Science Daily ● Dec. 15, 2023

The virus can cause mononucleosis or symptoms that may be dismissed as a cold.

From Seattle Times ● Dec. 26, 2022

The privileged, the few, the Junior Marthas have been laid waste by mononucleosis, leaving Heather all by herself.

From "Speak" by Laurie Halse Anderson