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usually uncountable, plural pneumonias or pneumoniæ or pneumoniae
An acute or chronic inflammation of the lungs caused by viruses, bacteria or other microorganisms, or sometimes by physical or chemical irritants. quotations examples
He had always been remarkably immune from such little ailments, and had only once in his life been ill, of a vicious pneumonia long ago at school.
1922, Michael Arlen, “2/9/1”, in “Piracy”: A Romantic Chronicle of These Days