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

But this innovative research sheds light on hitherto unrecognized connections between the brain and the immune system, which could be helpful in developing new treatments against various pathogens. —Paul Hsieh, Forbes.com, 31 July 2025

However, because sprouts aren't usually cooked, always be cautious about pathogens (germs). —Christopher Bergland, Verywell Health, 31 July 2025

Feddersen, who holds a doctorate in physical oceanography from Scripps, said that the model’s results compared favorably to the county’s daily pathogen monitoring, which has technicians collect samples and conduct DNA analysis in a certified lab. —Paul Sisson, San Diego Union-Tribune, 22 July 2025

Raw meat: Like pet waste, raw meat may contain pathogens that may survive the composting process. —Lauren Landers, Better Homes & Gardens, 10 July 2025

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