: a bacterium of the genus Legionella (L. pneumophila) that causes Legionnaires' disease

Browse Nearby Words

Cite this Entry

“Legionnaires' bacillus.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/Legionnaires%27%20bacillus. Accessed 26 Apr. 2025.

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!