[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
The mystery is what kind of pathogen or disease-causing organism could behave
  in such a pattern.
Research interests may include but are not limited to host-vector pathogen
  relationships and transmission biology.
As hoped, this compound augmented the potency of antibiotics in mice infected
  with this pathogen.
Close contact between two species represents an opportunity for a pathogen to
  expand its horizons and possibilities.
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