pathogen

noun

path·​o·​gen ˈpa-thə-jən 

: a specific causative agent (such as a bacterium or virus) of disease

Examples of pathogen in a Sentence

Recent Examples on the Web

Unused nutrients will become available to pathogens, creating collateral health challenges. — Aidan Connolly, Forbes.com, 25 Sep. 2026

Yet in rare instances, pathogens can establish themselves in the unborn’s environment and cause havoc. — Mike McRae 24, New Atlas, 25 Sep. 2026

Veterinarians are still examining Osiris and conducting more testing for a range of fungal, bacterial and viral pathogens, the aquarium said. — Lila Hempel-Edgers, Chicago Tribune, 25 Sep. 2026

Small dust particles and annoying pathogens can be lurking all around your home causing allergies to flair. — George Yang, PC Magazine, 25 Sep. 2026

Word History

Etymology

patho- + -gen, after pathogenic, pathogenesis

First Known Use

1880, in the meaning defined above

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 

: a specific causative agent (as a bacterium or virus) of disease