pneumonia

noun

pneu·​mo·​nia nu̇-ˈmō-nyə 

nyu̇-

: an acute disease that is marked by inflammation of lung tissue accompanied by infiltration of alveoli and often bronchioles with white blood cells (such as neutrophils) and fibrinous exudate, is characterized by fever, chills, cough, difficulty in breathing, fatigue, chest pain, and reduced lung expansion, and is typically caused by an infectious agent (such as a bacterium, virus, or fungus) see bronchopneumonia, pneumocystis carinii pneumonia, primary atypical pneumonia compare pneumonitis

Examples of pneumonia in a Sentence

He caught pneumonia over the winter.

Recent Examples on the Web

The fatality rate of measles is nearly 1 to 3 in 1,000 children, who die with respiratory (e.g., pneumonia) or neurological complications from the virus, according to the Centers for Disease Control and Prevention. —Ars Technica, 20 Mar. 2025

Out of every 1,000 cases, about 200 children require hospitalization, 50 develop pneumonia, one experiences brain swelling that can result in disability, and one to three will die. —Brandy Zadrozny, NBC News, 20 Mar. 2025

Measles is most often associated with a high fever and rash, but more severe cases can cause pneumonia or encephalitis. —Hannah Wiley, Los Angeles Times, 19 Mar. 2025

Francis has been hospitalized at Rome's Gemelli Hospital since February 14 for a complex lung infection that developed into pneumonia in both lungs. —Josh Hammer, Newsweek, 19 Mar. 2025

Word History

Etymology

New Latin, from Greek, from pneumōn lung, alteration of pleumōn — more at pulmonary

First Known Use

1603, in the meaning defined above

Phrases Containing pneumonia

• double pneumonia
• Pneumocystis carinii pneumonia
• primary atypical pneumonia
• walking pneumonia

Rhymes for pneumonia

• ammonia
• begonia
• bronchopneumonia
• pleuropneumonia

Kids Definition

pneumonia

noun

pneu·​mo·​nia n(y)u̇-ˈmō-nyə 

: a disease of the lungs marked by inflammation, congestion, fever, cough, and difficulty in breathing and caused especially by infection

Medical Definition

pneumonia

noun

pneu·​mo·​nia n(y)u̇-ˈmō-nyə 

: an acute disease that is marked by inflammation of lung tissue accompanied by infiltration of alveoli and often bronchioles with white blood cells (as neutrophils) and fibrinous exudate, is characterized by fever, chills, cough, difficulty in breathing, fatigue, chest pain, and reduced lung expansion, and is typically caused by an infectious agent (as a bacterium, virus, or fungus) see bronchopneumonia, lobar pneumonia, pneumocystis carinii pneumonia, primary atypical pneumonia