pathogen

The definition of a pathogen is an agent, like a microorganism, that causes disease.

(noun)

An example of a pathogen is salmonella.

See pathogen in Webster's New World College Dictionary

noun

any agent, esp. a microorganism, able to cause disease

Origin: patho- + -gen

See pathogen in American Heritage Dictionary 4

noun

An agent that causes disease, especially a living microorganism such as a bacterium or fungus.

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