[path-uh-juhn, ‐jen]
any disease-producing agent, especially a virus, bacterium, or other microorganism.

1940–45; patho- + -gen

antipathogen, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pathogen or pathogene (ˈpæθəˌdʒɛn, ˈpæθəˌdʒiːn)
any agent that can cause disease
pathogene or pathogene

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1880, a back formation from pathogenic.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

pathogen path·o·gen (pāth'ə-jən)
An agent that causes disease, especially a living microorganism such as a bacterium, virus, or fungus.

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
pathogen   (pāth'ə-jən)  Pronunciation Key 
An agent that causes infection or disease, especially a microorganism, such as a bacterium or protozoan, or a virus. See Note at germ.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
pathogen [(path-uh-juhn)]

A disease-causing agent. Microorganisms, viruses, and toxins are examples of pathogens.

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
Conventional poultry farms use antibiotics extensively, which contributes to
  the rise of antibiotic-resistant pathogens.
By contrast, testing for pathogens deals only with cases as they become
  apparent in transfusion patients.
The altered strain was rendered avirulent, because the immune system was able
  to eliminate the exposed pathogens.
There's also the threat of pathogens that could thrive in crowded pens and
  escape to harm natural fish populations.
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