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.
This group of fungal pathogens affects hundreds of plants, from important food crops to trees, shrubs, and flowers. Kim Toscano, Southern Living, 31 Dec. 2025 Raw shellfish such as clams, mussels and scallops can contain pathogens picked up from contaminated water. Katia Hetter, CNN Money, 31 Dec. 2025 In November, the Africa Centres for Disease Control and Prevention launched Africa Genome Archiving for Response and Insight, an online platform that will allow researchers across the continent to share genetic data on disease-causing pathogens of concern. Fran Kritz, NPR, 30 Dec. 2025 Raw goat milk poses food safety risks because it has not been treated to kill off harmful pathogens. Isabel Vasquez Rd Ldn, Health, 30 Dec. 2025 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 1 Jan. 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

Last Updated: - Updated example sentences
Love words? Need even more definitions?

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