MedicalTerminology DB

Meaning of germ: A bacterium, virus, or other microorganism that can cause infection and disease.

Definition of germ

A bacterium, virus, or other microorganism that can cause infection and disease.

Written and maintained by James Murray Last updated July 21, 2026 Educational reference, not medical advice. Read the limitations.

For learning, not diagnosis. This glossary provides general educational information and is not a substitute for advice from a qualified healthcare professional. If you may be experiencing a medical emergency, contact local emergency services.