Legionnaire's disease

World English Dictionary
legionnaire's disease or legionnaires' disease
 
n
a serious, sometimes fatal, infection, caused by the bacterium Legionella pneumophila, which has symptoms similar to those of pneumonia: believed to be spread by inhalation of contaminated water vapour from showers and air-conditioning plants
 
[C20: after the outbreak at a meeting of the American Legion at Philadelphia in 1976]
 
legionnaires' disease or legionnaires' disease
 
n
 
[C20: after the outbreak at a meeting of the American Legion at Philadelphia in 1976]

Collins English Dictionary - Complete & Unabridged 10th Edition
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