pneu·mo·nia

[noo-mohn-yuh, -moh-nee-uh, nyoo-]
noun Pathology.
1.
inflammation of the lungs with congestion.
2.
Also called lobar pneumonia. an acute disease of the lungs, caused by the bacterium Streptococcus pneumoniae and characterized by fever, a cough with blood-tinged phlegm, and difficult breathing.
Origin:
1595–1605; < Neo-Latin < Greek pneumonía. See pneumon-, -ia

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
pneumonia (njuːˈməʊnɪə) [Click for IPA pronunciation guide]
 
—n
inflammation of one or both lungs, in which the air sacs (alveoli) become filled with liquid, which renders them useless for breathing. It is usually caused by bacterial (esp pneumococcal) or viral infection
 
[C17: New Latin from Greek from pneumōn lung]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

pneumonia
c.1600, from Mod.L., from Gk. pneumonia "inflammation of the lungs," from pneumon (gen. pneumonos) "lung," altered from pleumon "lung," lit. "floater," from PIE *pleu- "to flow, to swim" (see pulmonary). Alteration in Gk. perhaps by influence of pnein "to breathe."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pneumonia pneu·mo·nia (n&oobreve;-mōn'yə, ny&oobreve;-)
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.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
pneumonia   (n-mōn'yə)  Pronunciation Key 
An acute or chronic disease marked by inflammation of the lungs, especially an infectious disease caused by viruses, bacteria, or other pathogens, such as mycoplasmas. Individuals with pneumonia often have abnormal chest x-rays that show areas with fluid in the infected part of the lungs.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
pneumonia [(nuh-mohn-yuh)]

A disease characterized by inflammation of the lungs. Pneumonia can be caused by many factors, including bacterial infections, viral infections, and the inhalation of chemical irritants.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
He had been in perfect health until three months earlier, when he suddenly
  developed pneumonia in both lungs.
They struggle to keep up in sports and are prone to flu and pneumonia.
The patient died 18 days later of pneumonia.
Pneumonia in his right lung can be seen as clearly as the pacemaker implanted
  to regulate the rhythm of his heart.
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