A substance or agent that opposes or counteracts the effects of a pathogen; an antimicrobial substance.
From anti- (against) + pathogen (disease-causing organism). A 20th-century term combining ancient anti- prefix with modern pathogen (from Greek pathos + -gen, source/origin), reflecting modern medicine's systematic approach to fighting disease.
This word shows how -anti words transformed once germ theory was established: suddenly 'anti-' could mean 'fighting disease-causing microbes' rather than just 'opposed to.' It's a vocabulary that grew directly from scientific discovery.
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