legionella
noun
le·gion·el·la
| \ ˌlē-jə-ˈnel-ə
\
\
Medical Definition of legionella
1
capitalized
: a genus of gram-negative rod-shaped bacteria (family Legionellaceae) that includes the causative agent (L. pneumophila) of Legionnaires' disease
2
plural legionellae\ -ˌē\
also legionellas
: a bacterium of the genus Legionella