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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Samples are being analyzed by the infectious diseases department of the Bordeaux teaching hospital, the Centre Hospitalier Universitaire de Bordeaux, to identify the pathogen, assess transmission risks and determine further measures. ABC News, 13 May 2026 And even though the breakthrough mRNA platform that gave us the COVID-19 vaccines can be quickly adapted to new pathogens, people are skeptical about taking them. Teri Sforza, Oc Register, 13 May 2026 Still, if hantavirus can spread through the air, that’s important for containing the pathogen as the ship’s passengers return to their respective countries and quarantine. Tanya Lewis, Scientific American, 13 May 2026 Then one of them sent him a link to a news story about an outbreak of a hantavirus, a potentially deadly pathogen traditionally carried by rodents, which had been reported on a cruise ship. Akash Kapur, New Yorker, 12 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 20 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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