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The Collaborative International Dictionary of English v.0.48 (gcide)

Quack \Quack\, v. i. [imp. & p. p. {Qvacked}; p. pr. & vb. n.
{Quacking}.] [Of imitative origin; cf. D. kwaken, G. quacken,
quaken, Icel. kvaka to twitter.]
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1. To utter a sound like the cry of a duck.
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2. To make vain and loud pretensions; to boast. " To quack of
universal cures." --Hudibras.
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3. To act the part of a quack, or pretender.
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Quack \Quack\, n.
1. The cry of the duck, or a sound in imitation of it; a
hoarse, quacking noise. --Chaucer.
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2. [Cf. {Quacksalver}.] A boastful pretender to medical
skill; an empiric; an ignorant practitioner.
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3. Hence, one who boastfully pretends to skill or knowledge
of any kind not possessed; a charlatan.
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Quacks political; quacks scientific, academical.
--Carlyle.
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Quack \Quack\, a.
Pertaining to or characterized by, boasting and pretension;
used by quacks; pretending to cure diseases; as, a quack
medicine; a quack doctor.
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