Legionnaires' bacillus

noun
Le·​gion·​naires' bacillus | \ˌlē-jə-ˈna(ə)rz-, -ˈne(ə)rz- \

Medical Definition of Legionnaires' bacillus 

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

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