Legionnaires' disease

noun

Le·​gion·​naires' disease ˌlē-jə-ˈnerz- How to pronounce Legionnaires' disease (audio)
variants or less commonly Legionnaire's disease
: pneumonia that is caused by a bacterium (Legionella pneumophila), is characterized initially by symptoms resembling influenza (as malaise, headache, and muscular aches) followed by high fever, cough, diarrhea, severe pneumonia, and mental confusion, and that may be fatal especially in elderly and immunocompromised individuals

Word History

Etymology

from its first recognized occurrence at an American Legion convention in 1976

First Known Use

1976, in the meaning defined above

Time Traveler
The first known use of Legionnaires' disease was in 1976

Dictionary Entries Near Legionnaires' disease

Cite this Entry

“Legionnaires' disease.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Legionnaires%27%20disease. Accessed 2 Dec. 2022.

Medical Definition

Legionnaires' disease

noun

variants also Legionnaire's disease
: pneumonia that is caused by a bacterium of the genus Legionella (L. pneumophila), that is characterized initially by symptoms resembling influenza (as malaise, headache, and muscular aches) followed by high fever, cough, diarrhea, lobar pneumonia, and mental confusion, and that may be fatal especially in elderly and immunocompromised individuals see pontiac fever
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