Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An acute or chronic disease marked by inflammation of the lungs, usually caused by a bacterium, virus, or other infectious agent.

from The Century Dictionary.

  • noun 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 the GNU version of the Collaborative International Dictionary of English.

  • noun (Med.) Inflammation of the lungs.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

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

[New Latin, from Greek pneumoniā, lung disease, alteration (influenced by pneuma, breath) of pleumoniā, from pleumōn, lung; see pleu- in Indo-European roots.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Ancient Greek πνευμονία (pneumonia, "lung disease"), from πνεύμων (pneumōn, "lung").

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