Definitions for Pathogenˈpæθ ə dʒən, -ˌdʒɛn
Random House Webster's College Dictionary
path•o•genˈpæθ ə dʒən, -ˌdʒɛn(n.)
any disease-producing agent, esp. a virus, bacterium, or other microorganism.
Origin of pathogen:
any disease-producing agent (especially a virus or bacterium or other microorganism)
Any organism or substance, especially a microorganism, capable of causing disease, such as bacteria, viruses, protozoa or fungi. Microorganisms are not considered to be pathogenic until they have reached a population size that is large enough to cause disease.
Dictionary of Military and Associated Terms
A disease producing microorganism that directly attacks human tissue and biological processes.