Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Quack
Medically reviewed by Dr. Otari Nergadze, Neurosurgeon | Updated: January 2026
Quack: 1) A practitioner who suggests the use of substances or devices for the prevention or treatment of disease that are known to be ineffective.
2) A person who pretends to be able to diagnose or heal people, but is unqualified and incompetent.