Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An acute or chronic disease marked by inflammation of the lungs and caused by viruses, bacteria, or other microorganisms and sometimes by physical and chemical irritants.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. An acute or chronic inflammation of the lungs caused by viruses, bacteria or other microorganisms, or sometimes by physical or chemical irritants.

from the GNU version of the Collaborative International Dictionary of English

  • n. Inflammation of the lungs.

from The Century Dictionary and Cyclopedia

  • n. Inflammation of the tissues of the lung, as distinct from inflammation of the bronchial tubes (bronchitis) and from inflammation of the serous covering of the lungs (pleuritis). Also called pneumonitis

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. respiratory disease characterized by inflammation of the lung parenchyma (excluding the bronchi) with congestion caused by viruses or bacteria or irritants

Etymologies

New Latin, from Greek pneumoniā, lung disease, alteration (influenced by pneuma, breath) of pleumoniā, from pleumōn, lung.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek πνευμονία (pneumonia, "lung disease"), from πνεύμων (pneumōn, "lung"). (Wiktionary)

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