pathogen

noun

path·​o·​gen ˈpa-thə-jən How to pronounce pathogen (audio)
: a specific causative agent (such as a bacterium or virus) of disease

Examples of pathogen in a Sentence

Recent Examples on the Web
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The exception is a pathogen in this family of viruses called the Andes virus—for which several people who were onboard the MV Hondius have tested positive. Adam Kovac, Scientific American, 7 May 2026 While the World Health Organization says the threat posed from the current outbreak on the cruise ship Hondius is low, WHO has classified hantaviruses as emerging priority pathogens with high potential to spark international public health emergencies because of how serious these infections can be. Brenda Goodman, CNN Money, 6 May 2026 The dairy in the products may be contaminated with Salmonella, a pathogen that can cause severe foodborne illness, though no illnesses have been reported to date. Jenna Anderson, Health, 4 May 2026 Hantaviruses, a family of pathogens, are spread by rodents, mostly mice, and excreted in the animals’ saliva, droppings and urine. Evan Bush, NBC news, 4 May 2026 See All Example Sentences for pathogen

Word History

Etymology

patho- + -gen, after pathogenic, pathogenesis

First Known Use

1880, in the meaning defined above

Time Traveler
The first known use of pathogen was in 1880

Browse Nearby Words

Cite this Entry

“Pathogen.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pathogen. Accessed 13 May. 2026.

Kids Definition

pathogen

noun
patho·​gen
ˈpath-ə-jən
: a germ (as a bacterium or virus) that causes disease

Medical Definition

pathogen

noun
patho·​gen ˈpath-ə-jən How to pronounce pathogen (audio)
: a specific causative agent (as a bacterium or virus) of disease

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