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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Discolored patches of grass are a sign of every kind of lawn fungus from different pathogens. David Beaulieu, The Spruce, 28 May 2026 The sea cucumber tissue could also be useful for ocean health research, by testing rising temperatures or pathogens in seawater. Jacopo Prisco, CNN Money, 28 May 2026 Recent evaluations show leading models generating plausible ideas for pathogen modification, evading DNA synthesis screening or providing step-by-step guidance that could assist nonexperts in bioweapon pathways. Jordan Henry, Forbes.com, 27 May 2026 Macrophages are the heavy lifters that engulf debris and pathogens. Mrigakshi Dixit, Interesting Engineering, 25 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 4 Jun. 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

More from Merriam-Webster on pathogen

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

More from Merriam-Webster