path·o·gen

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

Origin:
1940–45; patho- + -gen

an·ti·path·o·gen, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
pathogen or pathogene (ˈpæθəˌdʒɛn, ˈpæθəˌdʒiːn) [Click for IPA pronunciation guide]
 
n
any agent that can cause disease
 
pathogene or pathogene
 
n

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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00:10
Pathogens is always a great word to know.
So is interrobang. Does it mean:
a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

pathogen
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)
n.
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 canine influenza virus can cause respiratory disease by itself or along
  with other canine respiratory pathogens.
But the new study shows that dragons carried different pathogens in the their
  mouths.
By contrast, testing for pathogens deals only with cases as they become
  apparent in transfusion patients.
Pathogens in the vaccines were sometimes too weak to work.
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