Mononucleosis (noun)

1. An infectious disease caused by the Epstein-Barr virus (EBV) and characterized by symptoms such as fatigue, sore throat, and fever.
2. Informally referred to as 'mono' or the 'kissing disease'.

Origin:

The term 'mononucleosis' comes from the greek 'mono' meaning 'single' and 'nucleus' meaning 'center' or 'kernel'. the term was first used in the late 19th century to describe a disease characterized by an abnormal increase in the number of single-nucleated cells in the blood.

Examples:

1. The doctor diagnosed her with mononucleosis after she complained of persistent fatigue and a sore throat.
2. Mononucleosis is also known as the kissing disease because it can be spread through saliva.
3. Her mono symptoms included a high fever, swollen glands and fatigue.
4. Mononucleosis is a viral infection that affects the white blood cells.
5. The young adult was diagnosed with mononucleosis after he experienced a sore throat, fatigue and swollen lymph nodes.