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quack 1

The characteristic sound uttered by a duck.
intr.v. quacked, quack·ing, quacks
To utter the characteristic sound of a duck.

[Middle English quek, of imitative origin.]

quack′y adj.

quack 2

1. An untrained person who pretends to be a physician and dispenses medical advice and treatment.
2. A charlatan; a mountebank.
Relating to or characteristic of a quack: a quack cure.
intr.v. quacked, quack·ing, quacks
To act as a medical quack or a charlatan.

[Short for quacksalver.]

quack′er·y n.
quack′ish adj.
quack′ish·ly adv.
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References in periodicals archive ?
That the doctor who confirms the poisoning diagnosis bears the name Drake might also, as Johnson suggests, indicate we are meant to view his solution to be quackish rather than definitive (17).
Shoup explores the ITE in depth and makes clear its quackish nature, yet this institute's numbers constitute the professional convention.
Aromatherapy, once an obscure and slightly quackish activity, is now big business.