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  • Legionella
    Legionella
    noun
    a genus of rod- or coccus-shaped aerobic Gram-negative bacteria, certain species of which, as L. pneumophila, produce legionnaires' disease.
  • legionella
    legionella
    noun
    any Gram-negative rod-shaped bacterium of the genus Legionella, including L. pneumophila, which causes legionnaire's disease

Legionella

American  
[lee-juh-nel-uh] / ˌli dʒəˈnɛl ə /

noun

  1. a genus of rod- or coccus-shaped aerobic Gram-negative bacteria, certain species of which, as L. pneumophila, produce legionnaires' disease.


legionella British  
/ ˌliːdʒəˈnɛlə /

noun

  1. any Gram-negative rod-shaped bacterium of the genus Legionella, including L. pneumophila, which causes legionnaire's disease

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of Legionella

< New Latin (1979), after legionnaires' disease; see -ella

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

The report noted that cooling towers can spread Legionella bacteria over a wide area, with people living within 0.6 miles from a tower at highest risk of infection.

From Los Angeles Times • May 18, 2026

And in 2022, health investigators uncovered the likely source of 17 Legionella infections in Napa County — all of whom either lived, worked or had visited downtown Napa.

From Los Angeles Times • May 18, 2026

Other ways facility managers can reduce the risk of Legionella include disinfecting cooling towers and water systems, establishing a water management program and routinely performing water system maintenance.

From Los Angeles Times • May 18, 2026

Legionnaires' disease is a lung infection most commonly contracted through the inhalation of water droplets containing Legionella bacteria.

From BBC • Jun. 21, 2025

That followed problems, including traces of Legionella bacteria being found in the vessel’s on-board water system, days after the first asylum seekers boarded in August 2023.

From BBC • Oct. 31, 2024

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