Definition of "legionella" [legionella]

• Bacteria of the genus Legionella. (noun)

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• "The legionella bacteria also causes a milder illness called Pontiac fever."
• "And for an electric water heater, the cooler tank bottom that can result from this damage can become a breeding ground for legionella."
• "According to a health website, the disease is a type of pneumonia usually caused by the legionella pneumophila bacteria and is treatable with antibiotics."