Quack

Quack is the rather silly noise that a duck makes.

Quack is also a term for a deceitful person who pretends to be an expert in some field, especially medicine but doesn't really know very much and makes preposterous claims. A quack may also be someone who knows a great deal and makes preposterous claims to deceive people.

See also

• Pseudoscience
• Pseudoscience criteria
• Religious leader